lindab rectangular

8/10/2019 Lindab Rectangular

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1 We reserve the right to make changes without prior notice

air duct systems | rectangular

Content Rectangular

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DuctLKR .................................................6

BendsLBR .................................................7

LBXR...............................................8

S-bendLBSR...............................................9

TaperLDR...............................................10

Rect-to-roundtransition LORU ............................................11

CollarsLTR................................................12

LTRSR...........................................13

T-pieceLTROR ..........................................14

End coverLEPR.............................................15

Cleaning coversLKCR............................................ 16

IPF ..................................................17

Rectangular jointsystem

Flange profile RJFP ........................18

Corner RJCL...................................19

Bolt clamp RJBC............................20

Slide profile LS-3............................20

Bot RJB ..........................................20

Nut RJN..........................................20

Sealing moulding RJSM.................20

Rod RDR ........................................21

Rod bolt RDRB...............................21

Rod washer RDRW ........................21

Rod dowel RDRD ...........................21

Rod cross RDRC............................22

Vane fastener RDVFRDVF..............23


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Content Rectangular

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Joining parts Joining profile LS 1 ........................ 24

Joining profile LS 11 ...................... 24



Joining profile LS 3 ........................ 24



Regulatingdamper

LKSR.............................................. 25

Rectangularstraight silencers

DLD................................................26DLDR.............................................. 27DLDY..............................................37

Rectangular curvedsilencer

BDLD.............................................. 48

Rectangularstraight low-builtsilencer

LRLB ..............................................57


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General

Some products might differ slightly from country to country.

Please contact your local Lindab store for correct informa-

tion.

Rectangular consists of rectangular ducts, fittings and si-

lencers with dimensions in accordance with

SS-EN 1505 when not otherwise specified. The duct sys-

teme fulfils tightness class C and pressure class 2 according

to EN 1507:2006. All fittings and ducts are made of hot-dip

galvanized steel sheet Z 275. If higher corrosion protection is

needed, alu-zinc or stainless steel can be used.

A joining profile is mounted at the end of every fitting and

duct. A common slide profile LS-3 or bolt clamps and a seal

moulding, RJSM is needed to join components. So pre-cut

mouldings and an adequate length of seal moulding are sup-

plied in each delivery. Seals are made from temperature re-

sistant polythene. Recommended temperature range is -70to +80C.

Support distances of ducts and components must never ex-

ceed 2400 mm for any dimension. Nor may there be more

than one joint between two supports. The support must be

located max. 500 mm from a joint.

Non-standard ducts and duct components can be tendered

on request. Please enclose a dimensioned sketch if possible.

Tightness

Ducts and fittings fulfil tightness class C. This only applies on

condition that the products are installed in accordance with

the installation instruction.

Please refer to page 3536for more information about seal-ing classes and official requirements.

Strength

Standard ducts and duct components can withstand positive

of 1000 Pa and negative pressures of -750 Pa.

The ducts are manufactured to fulfil the requirements of

EN 1507:2006. This means that when the duct is submitted

to the maximum pressure of relevant pressure class than

the duct slide doesnt bulge or cave more than thesmallest value of 3% of its widh or 30 mm

the joint between two products doesnt bulge or cavemore than 1/250-part of the longest side width.

Larger ducts and fittings are reinforced by hat-shaped pro-

files and rods.

Dimensions and weightsThe I-measures given in the tables are the overall installa-

tion dimensions of products. The following tolerances apply,

depending on duct or fitting dimensions.

a and b are the internal duct or fitting dimensions.

Tolerances for dimensions a and b

when a + b < 1200: mm

when a + b > 1200: mm

Tolerances for I-measures mm

Hydraulic diameter dh

The diameter of a circular duct which gives the same pres-

sure drop at the same air velocity as in the rectangular duct.

Equivalent diameter deThe diameter of a circular duct which gives the same pres-

sure drop at the same air flow as in the rectangular duct.

Insulated ducts

Insulated ducts can be made in the following designs:

Internally condensation and heat insulated with

Lindtec

Internally insulated, clad with solid sheet metal Internally insulated, clad with perforated sheet metal Internal fire protection insulation 50 and 100 mm

a

b

+0-4+0-6

5

dh

Ac

O--------------

2 a b

a b+------------------= =
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General

Technical data for standard sizes

Cross-sectional area, Ac[m]

Circumference, O [m]

Hydraulic diameter, dh [mm]

b \ a 200 250 300 400 500 600 800 1000 1200 1400 1600 1800 2000

100 0,02 0,03 0,03 0,04

150 0,03 0,04 0,05 0,06 0,08 0,09

200 0,04 0,05 0,06 0,08 0,10 0,12 0,16

250 0,06 0,08 0,10 0,13 0,15 0,20 0,25

300 0,09 0,12 0,15 0,18 0,24 0,30 0,36

400 0,16 0,20 0,24 0,32 0,40 0,48 0,56 0,64

500 0,25 0,30 0,40 0,50 0,60 0,70 0,80 0,90 1,00

600 0,36 0,48 0,60 0,72 0,84 0,96 1,08 1,20

800 0,64 0,80 0,96 1,12 1,28 1,44 1,60

1000 1,00 1,20 1,40 1,60 1,80 2,00

1200 1,44 1,68 1,92 2,16 2,40

b \ a 200 250 300 400 500 600 800 1000 1200 1400 1600 1800 2000

100 0,6 0,7 0,8 1,0

150 0,7 0,8 0,9 1,1 1,3 1,5

200 0,8 0,9 1,0 1,2 1,4 1,6 2,0

250 1,0 1,1 1,3 1,5 1,7 2,1 2,5

300 1,2 1,4 1,6 1,8 2,2 2,6 3,0

400 1,6 1,8 2,0 2,4 2,8 3,2 3,6 4,0

500 2,0 2,2 2,6 3,0 3,4 3,8 4,2 4,6 5,0

600 2,4 2,8 3,2 3,6 4,0 4,4 4,8 5,2

800 3,2 3,6 4,0 4,4 4,8 5,2 5,6

1000 4,0 4,4 4,8 5,2 5,6 6,0

1200 4,8 5,2 5,6 6,0 6,4

b \ a 200 250 300 400 500 600 800 1000 1200 1400 1600 1800 2000

100 133 143 150 160

150 171 188 200 218 231 240

200 200 222 240 267 286 300 320

250 250 273 308 333 353 381 400

300 300 343 375 400 436 462 480

400 400 444 480 533 571 600 622 640

500 500 545 615 667 706 737 762 783 800600 600 686 750 800 840 873 900 923

800 800 889 960 1018 1067 1108 1143

1000 1000 1091 1167 1231 1286 1333

1200 1200 1292 1371 1440 1500

Ac= a b

O = 2 (a + b)

dh = 4 Ac/O =

2 a b/ (a + b)


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General

Equivalent diameter, de [mm]

Specific weight, ml[kg/m]

b \ a 200 250 300 400 500 600 800 1000 1200 1400 1600 1800 2000

100 152 169 183 207

150 189 210 229 260 287 310

200 219 244 267 305 337 366 414

250 274 299 344 381 414 470 518

300 328 378 421 458 521 575 621

400 438 489 534 610 675 732 783 829

500 547 599 688 763 829 888 941 991 1036

600 657 757 842 916 982 1043 1098 1150

800 876 978 1068 1148 1221 1289 1351

1000 1095 1199 1292 1376 1454 1527

1200 1314 1419 1514 1602 1684

b \ a 200 250 300 400 500 600 800 1000 1200 1400 1600 1800 2000

100 5 6 6 8

150 6 6 7 9 10 12

200 6 7 8 10 11 13 16

250 8 9 10 12 14 17 21

300 10 11 13 14 17 22 25

400 13 14 16 19 23 27 31 44

500 16 17 21 25 28 33 46 50 55

600 19 22 27 30 34 48 53 57

800 25 30 33 37 53 57 62

1000 34 38 42 58 62 67

1200 41 45 62 67 72

de = 2 b (2-n (1 + a/b)1+n/(a/b)3)1/(n-5)

where n = 1/(1,05 log (Re) -0,45)

where Re = vm dh/

where vm= 5 m/s

and = 0,000 000 101 312 t + 0,010 013 001 375 72

where t = 20C


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Duct LKR


DescriptionStraight duct, stiffened with transverse trapezoid corruga-tions, which reduces the risk of noise generation. Largerdimensions have stiffening profiles and/or internal rods.Installation height of these profiles is 23 mm.

When a or b 1200, standard lengths are 2400 or 1250 mm.If a or b >1200, standard length is 1250 mm. Other lengthscan be ordered.

Ducts are normally supplied with a strong joining profileRJFP 20 or RJFP 30 at each end, but can also be supplied

as a flexible piece, where the joining profile on one end isnot fixed. Also available with an end cover fixed by joiningprofiles.

Dimensions

Ordering example

* applies when a or b 200 mm

LKR 500 300 1 1

Product

largest side a

Smallest side b

L = 2400 mm* 1

L = 1250 mm 2

L < 2400 mm L

RJFP-joint at both ends 1

RJFP-joint at one endLoose joint included.

2

RJFP-joint at one endEnd cover on joining profiles atother end.

3

End cover on joining profiles atboth ends.

4

RJFP-joint at one endNo loose joint included.

5

L a

b

LKR


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Bend LBR


DescriptionBend with sharp outer corner, stiffened with trapezoid cor-rugation.The bend is delivered with 90 or 45 angles and joining pro-file RJFP at both ends. Other leg lengths and angles canalso be ordered.Standard design l1= l2= 125 mm.

Dimensions

Ordering example

LBR 500 300 500 1 1 1

Product

Form side a1Curved side b

Form side a290 1

45 2

Angle

125 mm 1

Leg length l1125 mm 1

Leg length l2

ba2l1

l2

a1

a/3

ba2 l2

l1

a1

Guide vane

at a 800

LBR


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Bend LBXR


DescriptionBend with rounded outer corner, stiffened with trapezoidcorrugations.

The bend is delivered with 90 or 45 angles and joining pro-files type RJFP at both ends. Other leg lengths and anglescan also be ordered.

Standard design l1= l2= 125 mm.

Dimensions

Ordering example

LBXR 500 300 500 1 1 1

Product

Form side a1Curved side b

Form side a290 1

45 2

Angle

125 mm 1


Leg length l2

ba2

l2

a1

a/3

l1

Guide vane

at a 800

ba2 l2

a1

l1

LBXR


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S-bend LBSR


DescriptionUsed for deflections of the duct system, for example whereducts cross.

Has a joining profile type RJFP at both ends, and is stiffenedby trapezoid corrugations.

A special relationship is needed between the a-dimension,fall f and length l for the LBSR to retain its cross-sectionalarea and not restrict the air flow. For this reason, standardlengths and standard drops have been prepared.

Dimensions

Ordering example

LBSR 300 600 300 400

Product

Form side a

Curved side b

Fall f

Length l

amm

lstdmm

fstdmm

100 400 300

150 400 300

200 400 300

250 400 300

300 400 300

350 400 300

400 500 400

450 500 400500 600 400

600 700 400

700 800 500

800 900 500

900 1000 500

1000 1100 500

1100 1200 500

1200 1300 500

1300 1400 500

1400 1500 500

1500 1600 500

1600 1700 500

1800 1900 500

2000 2100 500

b

l

af

LBSR


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Taper LDR


DescriptionThe taper is used as transition between different ductdimensions. The larger dimensions are available with offsetsas in the coded sketches.

Dimension changes have a joining profile type RJFP at bothends, and are stiffened by trapezoid corrugations.

Measures e and h only need to be given for alternative 6.Negative values for e, for example, mean that e is outsideside a.

Dimensions

Ordering example

LDR 500 300 300 200 1 450 50 100

Product

Large end a

Large end b

Small end c

Small end d

The alternative displace-ments are seen from thecd end

1 6

Length l

Displacement h (Only at the alternative 6.)

Displacement e (Only at the alternative 6.)

amm

lstdmm

100 300

150 300

200 300

250 300

300 300

350 300

400 450

450 450

500 450

600 450700 450

800 600

900 600

1000 600

1100 600

1200 600

1300 600

1400 600

1500 600

1600 600

1800 600

2000 600

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c

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LDR


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Rect-to-round transition LORU


DescriptionRect-to-round transition are used between rectangular andcircular ducts. The rectangular connection has joining pro-files type RJFP and the circular connection has Safe seal.

The rectangular connection is available with offsets as in thecoded sketches.

Measures e and h only need to be given for alternative 6.Negative values for e, for example, mean that e is outsideside a.

Dimensions

Ordering example

LORU 500 300 160 1 450 100 200

Product

Largest side a

Smallest side b

Diameter d1The alternative dis-placements are seenfrom the circular end 1 6

Length l

Displacement h (Only at alternative 6.)

Displacement e (Only at alternative 6.)

amm

lstdmm

100 300

150 300

200 300

250 300

300 300

350 300

400 450

450 450

500 450

600 450

700 450

800 600

900 600

1000 600

1100 600

1200 600

1300 600

1400 600

1500 600

1600 6001800 600

2000 600

2

54

6

3

d1

l

e

a

h

b

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LORU


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Collar LTR


DescriptionThe collar is used for connection to rectangular duct. Thesmaller joint end is provided with joining profiles type RJFP.The larger one has an edge, for fixing with blind rivets orself-tapping screws, but can also be given a folding tab tofacilitate assembly.

Dimensions

Ordering example

LTR 500 300 125 v

Product

Form side a

Curved side b

Length

OptionFixing with folding tabs

125 30

b

a

LTR


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Collar on circular duct LTRSR


DescriptionThe collar is used for connection to circular duct. The rec-tangular end is provided with joining profiles type RJFP. Therounded end has an edge, for fixing with blind rivets or self-tapping screws.

Other lengths can also be supplied.

Dimensions

Ordering example

LTRSR 600 300 400 125

Product

Side a

Side b

Diameter d

Length

125

d

b a

30

30

LTRSR


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T-piece LTROR


DescriptionA T-piece which is provided with joining profiles type RJFPand is stiffened with trapezoid corrugations.Standard design l1= l2= l3= 125 mm.Other leg lengths can also be supplied.

Dimensions

Ordering example

LTROR 600 600 800 400 1 1 1

Product

Side a1Side a2Side a3Side b

125 mm 1



Leg length l3

ba3

a2

l1 l2

l3

a1

LTROR


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End cover LEPR


DescriptionUsed as end cover in duct.

The edges are equipped with joining profiles type RJFP.

The end cover is stiffened with trapezoid corrugations.

Dimensions

Ordering example

LEPR 500 300

Product

largest side a

Smallest side b

a

b

LEPR


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Cleaning cover LKCR

DescriptionThe cleaning cover is also used as an inspection hatch forrectangular ducts. To the cleaning cover belongs a fixingframe, which is attached to the rectangular duct. This is nor-mally done with blind rivets through the folded-down edgeof the done frame. It can also be provided with folding tabson request.It is easy to remove the cleaning cover from the fixing frameby using over-centre catches. In the insulated versions, theinner side will always be in level with the innermost bound-ary line of the duct, irrespective of whether the duct is insu-

lated internally or externally. The table below shows theinsulation thickness of the cover at different duct insulationalternatives.The cover should not be placed closer than 50 mm from thenearest side of the rectangular duct.Maximum square measurement of the cleaning cover is

11701170 mm

Dimensions

Ordering example

LKCR 500 300 2 50/100 v

Product

Largest side a

Smallest side b

Non-insulated duct Type 1

Internally insulated duct Type 2

Externally insulated duct Type 3

Duct/cover insulation 30/80 mm (Type 2)







Duct/cover insulation 70/100 mm (Type 3)Duct/cover insulation 140/160 mm (Type 3)

Option

Fixing with folding tabs

b

50

80

80

a 50

1

2

3

Non-insulated duct

Internally insulated duct

Externally insulated duct

LKCR


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Access door IPF


DescriptionCleaning cover without fixing frame. Easy to install andremove.

Dimensions

a and b are dimensions of hole

Ordering example

IPF 300 200

Product

Largest side a

Smallest side b

amm

bmm

hmm

mkg

250 150 50 0,65

300 200 50 1,10

450 350 50 2,78

600 450 70 4,90

b

IPF


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Rectangular joint system

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The joint system is strong, airtight andeasy to install.

Flange profiles

Corners

Flange profile fasteners

Corner fasteners

Seal moulding

Flange profilesRJFP Rectangular Joint Flange Profil comes in three sizes,

different sheet steel thicknesses, with and without sealant.

Dimensions

RJFP 20

RJFP 30

RJFP 40

Code Dim Length Material Type Thickness

RJFP 20 5000 GALV 0,7

RJFP 20 5000 GALV SEAL 0,7

RJFP 20 5000 GALV 0,8

RJFP 20 5000 GALV SEAL 0,8RJFP 30 5000 GALV 0,8


RJFP 30 5000 GALV 0,9


RJFP 40 5700 GALV 1,13

RJFP 40 5700 GALV 1,2

Ordering example

RJFP 20 5000 GALV 0,7

Product

Dimension

Length

Material

Thickness


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Corners

RJCL 20

The corner is constructed to fit the flange profile RJFP 20.

Length 63 is to be used when the side of the duct is verysmall. Up to 100 mm.

Length 73 is to be used in all normal cases where the 20profile is used.

Length 95 is to be used as a compromise when the side ofthe duct is large but the bigger profile RJFP 30 is too high.

RJCL 30

The corner is constructed to fit the flange profile RJFP 30.

RJCL 40

The corner is constructed to fit the flange profile RJFP 40

Ordering example

RJCL 20 63 GALV 3

Product

Dimension

Length

Material

Thickness

Dimensions

Code Dim Length Material Thickness

RJCL 20 63 GALV 3

RJCL 20 73 GALV 3

RJCL 20 95 GALV 3RJCL 30 103 GALV 3

RJCL 40 123 GALV 4


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Flange profile fasteners

RJBC

Rectangular Joint Bolt Clamp

The clamp is easy to use where there is sufficient space to

fasten the clamp.

LS-3

Rectangular Joint Slide Profile

The slide profile does not demand space above the profile,but there has to be space at the side of the duct.

Corner fastenersThe M8 bolt and nut is to be used with all the RJCL 20

corners. The M10 bolt and nut is to be used with RJCL 30and 40 corners.

RJB

Rectangular Joint Bolt

RJN

Rectangular Joint Nut

Seal moulding

RJSM

Rectangular Joint Seal Moulding

The 9 mm seal moulding is to be used with RJFP 20 profile.

The 12 mm seal molding is to be used with RJFP 30 and 40profiles.

Dimensions

Code Dim Length Material Thickness

RJBC GALV

LS-3 5000 GALV

RJB 8 25 GALV

RJB 10 25 GALV

RJN 8 GALV

RJN 10 GALV

RJSM 9 10000 PE 4

RJSM 12 10000 PE 4

Ordering example

RJBC GALV

Product

Material


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Rectangular duct stiffeners

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The rod is round and together with thecrosses and the rod fasteners it willdecrease the bulging and caving of theduct.

Rod

Rod fasteners

Rod crosses

Rod

RDR

Rectangular Duct Rod

Rod fasteners

RDRB

Rectangular Duct Rod Bolt

RDRW

Rectangular Duct Rod Washer

RDRD

Rectangular Duct Rod Dowel

Dimensions

Code Dim Length Material

RDR 6000 GALV

RDRB 6 40 GALV

RDRW GALV

RDRD 6

Ordering example

RDR 6000 GALV Product

Material


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Rod crosses

RDRC

Rectangular Duct Rod Cross

The metal cross is used for large ducts.

The plastic cross is used for small ducts.

Ordering example

RDRC GALV

Product

Material

Dimensions

Code Material

RDRC GALV

RDRC PE


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Rectangular duct vanefasteners

The vane fasteners are easy to mount andgives a stable and airtight construction.

Vane fasteners

Vane fastenersRectangular Duct Vane Fastener

RDVF

Dimensions

Ordering example

The small Vane Fastener is used for sheet steel thickness0,50,9 mm.

The large Vane Fastener is used for sheet steel thickness0,91,25 mm.

Code Material Type

RDVF GALV SMAL

RDVF GALV LARG

RDVF GALV SMAL

Product

Material

Type

RDVF


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Joining parts


Description

Joining profile LS 1Joining profile designed to be fixed to the duct by emboss-ing with a special pincers. It is sealed to the duct by specialfactory-applied seam putty. Profile height is app. 20 mm.Normally supplied in 5 m lengths.

Specific weight: 0,40 kg/m

Joining profile LS 11Joining profile designed to be spot welded to the duct. It issealed to the duct by special factory-applied seam putty.Profile height is app. 20 mm. Normally supplied in 5 mlengths.


Seal moulding LS 21The seal moulding is intended to be installed in each joiningprofile.Made from polythene foam. Supplied in 10 m coils.

Seal moulding LS 31The seal moulding is intended to be installed in each joiningprofile.Made from polythene foam.Included as standard with all orders.

Supplied in 250 m in cartons.

Slide profile LS 3Used to join two ducts or fittings which both have joiningprofiles.Normally supplied in 5 m lengths.


Inner corner LS 4Used to keep the seal moulding in place and give the venti-lation duct stiffness and stability.

Outer corner LS 5Used outside the slide profile to protect the seal mouldingand stiffen the joint. Gives a neat finish.

Other joining methodsIf you do not want to fix ducts or duct components togetherwith slide mouldings, as described above, we can meet your

needs. You must then specify the particular method of join-ing you want, in plain language. For example: blind rivetedge 25 mm, flat bar flange to a particular standard, orequivalent.


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Regulating damper LKSR

Description

Rectangular regulating damper

Consists of a duct with trapezoid corrugations and a turningblade. Blade angle can be adjusted 090 using the knob inthe cup, and blade angle is read from an embossed scale onthe edge of the cup. Locking is done by two Pozidriv screws(PZD2).

Please refer to page * for general information aboutdampers.

The damper is provided with a joining profile at each end.

The length is normally b + 10, but the damper can also beordered in special lengths.

The cup allows an insulation thickness of 50 mm. If thickerinsulation is needed, add the special insulation cup IK to thedamper.

Maximum size for the damper is 600 600 mm.LKSR is equipped with joining profile type RJFP.

Dimensions

Ordering example

LKSR 500 300 1

Product

Side in mm aKnob side in mm b

Normal length in mml = b+10 1

a

l

b

b

2+5

LKSR


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Rectangular straight silencer DLD

DescriptionDLD has a conventional design with dimensions that notexceed the corresponding connection dimensions. Thesilencer can be manufactured in all standard duct sizes.

Design

DLD has an outer sheet casing of trapezoidal corrugatedsheet metal for stability and reduced risk of natural oscilla-tion.DLD is designed for low air resistance with baffle combina-tions that attenuate particularly low-frequency noise well.The type of insulation material has been developed to pro-

vide good noise properties, low weight and to be cleanable.

DLD meets the requirements of air tightness class C andpressure class 2 according to EN 1507:2006.DLD is equipped with joining profile type RJFP.

Tools for dimensioning and planning

The software CADventand DIMsilenceroffer features fordimensioning and selection of products in an environmentwith 3D modelling. Computerised planning can be con-ducted with automatic presentation of noise levels, pressuredrop etc.

Dimensions

If alternative material is required, this shall be stated whenordering, e.g. aluminium zinc (AZ185) and stainless acid-proof steel.The silencer is also available with the following accessories/options.

TRA = Non-insulated inspection hatch.TRB = Hatch intended for external insulation.*

TRC = Hatch intended for external insulation.*

TP = Absorbent lined with perforated sheet.

AIA = 50 mm fire protection insulation. Note! a and bdimensions increase by 100 mm.

AIB = 100 mm fire protection insulation. Note! a and bdimensions increase by 200 mm.The dimension of the hatches is adapted for cleaning andinspection of all baffle spacings.

Manual dimensioning see page 28.* Specify insulation thickness when ordering.

b

a

l

Ordering example

DLD 800 600 650 1015 TRA

Product

Width height a b

Length l

Code

Accessories

Rectangular straight silencer DLD


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Rectangular straight silencer DLDR

DescriptionDLDR has a conventional design with dimensions that notexceed the corresponding connection dimensions. Thesilencer can be manufactured in all standard duct sizes.

The silencer is provided with cleaning hatch and removablebaffles.

Design

DLDR has an outer sheet casing of trapezoidal corrugatedsheet metal for stability and reduced risk of natural oscilla-tion.

DLDR is designed for low air resistance with baffle combina-tions that attenuate particularly low-frequency noise well.The type of insulation material has been developed to pro-vide good noise properties, low weight and to be cleanable.

DLDR meets the requirements of air tightness class C andpressure class 2 according to EN 1507:2006.DLDR is equipped with joining profile type RJFP.


The software CADvent and DIMsilencer offer features fordimensioning and selection of products in an environmentwith 3D modelling. Computerised planning can be con-ducted with automatic presentation of noise levels, pressuredrop etc.

Dimensions

If alternative material is required, this shall be stated whenordering, e.g. aluminium zinc (AZ185) and stainless acid-proof steel.

The silencer is also available with the following accessories/options.

TRB = Hatch intended for external insulation.*TRC = Hatch intended for external insulation.*TP = Absorbent lined with perforated sheet.AIA = 50 mm fire protection insulation. Note! a and bdimensions increase by 100 mm.AIB = 100 mm fire protection insulation. Note! a and bdimensions increase by 200 mm.The dimension of the hatches is adapted for cleaning andinspection of all baffle spacings.

Manual dimensioning see pages 28.

* Specify insulation thickness when ordering.

a

b

l

Ordering example

DLDR 800 600 750 1015 1 TRB

Product

Width height a b

Length l

Code

Alternative for placing of hatch(Alt 1 on top, alt 2 on side, alt 3 on bottom.)

Accessories

Rectangular straight silencer DLDR


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Rectangular straight silencer DLD/DLDR

anua es gn ng or anA number of silencers can be designed manually, for more combinations of silencers and faster calculations use DIMsilencer.

Manual method of calculation is shown below:A Specify connection dimensions and flow-type location of the silencer.

B Specify the sound power level before the silencer.Read the insertion attenuation from the tables on page 164.Calculate the sound power level after the silencer irrespective of the air flow (selv generated noise).

Insertion attenuation

C Determine the pressure drop with help of the graph on page 161and table on page 162.In this case we have straight ducts before and after the silencer.

Pressure drop

D Determine the self generated noise from the silencer at present air flow.Calculate the sound power level after the silencer inclusive the self generated noise.

Self generated noise

Width 800 mm

Heigh 1000 mm

Length 1250 mm

Location Exhaust air

DLD-800-1000-1250-1016

63 Hz 125 Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000HzResistance

number

Self gene-

rated noise

number inlet

Sound power level

before silencer72 73 73 64 62 59 52 44

Attenuation from

table page 1643 9 16 23 23 17 12 9 2,8 2,7

Sound power level

after silencer withoutself generated noise

69 64 57 41 39 42 40 35

Area 0,8 m Air flow 400 l/s

Graph on page 161, use resistance number, area and air

velocity

Air velocity5 m/s

Pressure drop42 Pa

Correction at disturbance according table on page 162 Factor1

Pressure drop

after correction42 Pa

63 Hz 125 Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000Hz

Graph on page 163, use resistance number

and air velocity59 55 54 51 48 45 41 35

Correction for gross cross section area -1 -1 -1 -1 -1 -1 -1 -1

Self generated noise 58 54 53 50 47 44 40 34

Sound power level after the silencer 69 64 58 51 48 46 43 38

(Logarithmical addition of self generated noise and sound power level after the silencer without self generated noise)

http://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdf


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The following table can be used for own manual

calculations in accordance with the example on the previous page.

Designing table for DLD and DLDR


Pressure drop


With mm

Height mm

Length mm

Location


Resis-

tance num-

ber

Self gene-

rated noise

number inlet

Sound power level

before silencer

Attenuation from

table page 164

Sound power level

after silencer without

self generated noise

Area m Air flow l/s


velocity

Air velocitym/s

Pressure dropPa

Correction at disturbance according table on page 162 Factor Pressure drop

after correctionPa



and air velocity

Correction for gross cross section area


Sound power level after the silencer


http://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdf


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Pressure dropFollow the directions below and the adjoining graph.

Calculate the gross cross section area a b in m.

Go horizontal in the graph to the present air flow, l/s.

Go up to the resistance number achieved from the tableson page 164.

Read the pressue drop over the silencer, at straight ductconnection before and after the silencer, (factor 1,0). Forother modes of connection see the table for correction onpage 162.

Air flow velocity, which is used at the calculation of the

self generated noise, can be read here.

1

2

3

4

5

4 5 6 7 8321 9 10

5

4

3

2

0,1

0,2

0,3

0,4

0,5

1

1,5

v [m/s]

Ac

[m]

200

150

10

15

20

30

40

50

60

708090

100

pt[Pa]

1

5

2

3

4

R

30

20

15

10

8

6

4

3

2

1,5

1

30000200001500010000

600040003000200015001000

600400300

200150

q [l/s]

http://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdf


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Pressure dropPresent pressure drop = Read pressure drop below factor

D = The largest connection side (a or b) of the silencer.

The table contains of a selection of the most common disturbance cases.

Logarithmic addition

3D 2D 1D 0D 0D 1D 2D 3D

Duct

Duct

Duct

Duct

Duct branch

BendBend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

BendBend

Bend

Bend

Bend

Bend

Bend

BendBend

Bend

Bend

Duct

DuctDuct

Duct

Duct

Silencer

SilencerSilencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

SilencerSilencer

Silencer

Silencer

Silencer

Silencer

Silencer

1,0

1,11,2

1,4

1,5

1,2

1,3

1,3

1,4

1,5

1,6

1,71,8

1,9

2,0

2,0Ka mmar

am mare 3,0

Ka mmar am mare 3,5

Bend

Chamber

Chamber

ChamberChamber

Before the silencer

Distance before the silencer Distance after the silencer

Silencer After the silencer

Factor

[dB]

[dB]

Increamenttoaddto

thehighestdB-value

3

2

1

00 5 8 10

Difference between dB-valuesto be added

15 20

DLD/DLDR


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Self generated noise per frequence bandDecide from the location of the silencer whether it is thesupply or exhaust graph that shall be used. (Rule of mem-ory - the side that leads away from the fan, i.e. at supplyair the outlet graph is used and at exhaust air the in-takegraph.)

Go horizontally into the present graph, at present air ve-locity, to the self generated noise number.

Then go vertically up to the crossing of the different fre-quency band lines.

Read the self generated noise, at gross cross section area1 m, for each frequency band straight out to the left. Inthe example only the 8000 Hz-reading is shown.

Add or subtract the correction for the present gross crosssection area.

Sound power level after the silencerThe sound power level after the silencer can be calculated for

all frequences by a logarithmical addition of:

The self generated noise and The sound power level

before the silencer.

The shown example gives at 8000 Hz:

Self generated noise = 35 dB - 1 dB = 34 dB

Sound power level before the silencer - the attenuation:

44 dB - 9 dB = 35 dB

Logarithmic addition of 34 and 35 = 36 dB

(See graph for logarithmical addition on page 162.)

-10,0

0,0 10,0

- 10,0

0,0 10,0

Self generated noise in intake DLD/DLDR/DLDY Self generated noise in outlet DLD/DLDR/DLDY

Selfgeneratednoiseatgrosscrosssectionarea1m

(Correctionfactortootherareaaccordingtoabove.

)

Airvelocity

(Velocityovergrosscrosssectionarea.)

Airvelocity

(Velocityovergrosscrosssectionarea.)

Selfgeneratednoiseatgrosscrosssectionarea1m

(Correction

factortootherareaaccordingtoabove.)

Correction for gross cross section area:

a b in m: 1 2 3 80,1

-10

0,4

-7

0,8

-4 -1 0 +3 +6

10

+9 +10

0,2

Correction for gross cross section area:

a b in m: 1 2 3 80,1

-10

0,4

-7

0,8

-4 -1 0 +3 +6

10

+9 +10

0,2

dB(A)

63 Hz

125 Hz250 Hz

500 Hz1 kHz

2 kHz

4 kHz 8 kHz

1,5

2

3

4

5 6 7 8 9 10

10 m/s

5 m/s

3m/s

2 m/s

5 m/s

3m/s

2 m/s

10 m/s

70 dB

60 dB

50 dB

40 dB

30 dB 30 dB

70 dB

60 dB

50 dB

40 dB

dB(A)

63 Hz

125 Hz

250 Hz

500 Hz

1 kHz

2 kHz 4 kHz 8 kHz

1,5

2

3

4

5 6 7 8 9 10

Selfgeneratednoisenumber


10

9

8

7

6

Outdoor air

Extract air

Supplyair

Exhaust

air

OutletRoom

Intake

Out-

doors

Fan

Fan IntakeOutlet

7

8

9

10

DLD/DLDR
http://../AirDuctSystems/DLDDLDRManualdesigning.pdfhttp://../AirDuctSystems/DLDDLDRManualdesigning.pdf


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Width a

mm

Code

Length l mm Static insertion attenuation / octave band [dB]

Resis-tance

number

Self gen-eratednoise

number

Intake


number

OutletDLD DLDR 63 125 250 500 1000 2000 4000 8000400 1009 650 750 2 4 7 11 10 9 7 5 1,0 2,0 1,6

400 1010 650 750 2 6 9 14 13 11 8 6 2,5 2,7 2,0

400 1011 650 750 3 8 12 19 19 14 11 9 6,9 4,0 2,7

400 1009 1250 1350 2 7 12 18 18 13 10 7 1,2 2,0 1,6

400 1010 1250 1350 3 9 16 23 23 17 12 9 2,8 2,7 2,0

400 1011 1250 1350 5 13 22 31 32 24 17 13 8,0 4,0 2,7

400 1009 1850 1950 2 10 18 25 26 18 13 9 1,3 2,0 1,6

400 1010 1850 1950 4 13 23 32 33 24 16 12 3,2 2,7 2,0

400 1011 1850 1950 6 18 32 43 46 34 23 17 9,1 4,0 2,7

500 1013 650 750 2 6 8 12 10 9 7 5 2,2 2,5 2,0

500 1014 650 750 3 7 10 15 13 11 8 6 4,7 3,3 2,5

500 1013 1250 1350 3 10 15 20 18 13 10 7 2,4 2,5 2,0

500 1014 1250 1350 5 12 19 25 23 17 12 9 5,3 3,3 2,5

500 1013 1850 1950 4 13 22 28 26 18 13 9 2,6 2,5 2,0

500 1014 1850 1950 6 17 28 35 33 24 16 12 5,9 3,3 2,5

600 1012 650 750 2 6 9 17 19 14 11 9 3,1 3,0 2,0

600 1014 650 750 4 9 14 23 29 23 18 14 15,3 6,0 3,0

600 1017 650 750 3 7 10 13 10 9 7 5 3,8 3,0 2,4

600 1012 1250 1350 3 9 17 28 32 24 17 13 3,8 3,0 2,0

600 1014 1250 1350 5 15 27 38 50 40 29 22 19,1 6,0 3,0

600 1017 1250 1350 5 12 18 21 18 13 10 7 4,1 3,0 2,4

600 1012 1850 1950 3 13 25 39 46 34 23 17 4,4 3,0 2,0

600 1014 1850 1950 7 21 39 53 60 57 39 29 22,9 6,0 3,0

600 1017 1850 1950 6 17 26 30 26 18 13 9 4,5 3,0 2,4

700 1012 650 750 2 5 8 13 13 11 8 6 1,6 2,3 1,8

700 1013 650 750 3 7 11 18 19 14 11 9 4,8 3,5 2,3

700 1012 1250 1350 2 8 14 22 23 17 12 9 1,9 2,3 1,8

700 1013 1250 1350 4 11 20 30 32 24 17 13 5,7 3,5 2,3

700 1012 1850 1950 3 11 21 30 33 24 16 12 2,2 2,3 1,8

700 1013 1850 1950 5 16 29 42 46 34 23 17 6,5 3,5 2,3

800 1014 650 750 2 4 7 11 10 9 7 5 1,0 2,0 1,6

800 1015 650 750 2 7 11 21 25 19 15 12 6,1 4,0 2,3

800 1016 650 750 2 6 9 14 13 11 8 6 2,5 2,7 2,0

800 1017 650 750 3 8 12 19 19 14 11 9 6,9 4,0 2,7

800 1014 1250 1350 2 7 12 18 18 13 10 7 1,2 2,0 1,6

800 1015 1250 1350 3 11 21 36 44 33 24 18 7,6 4,0 2,3

800 1016 1250 1350 3 9 16 23 23 17 12 9 2,8 2,7 2,0

800 1017 1250 1350 5 13 22 31 32 24 17 13 8,0 4,0 2,7

800 1014 1850 1950 2 10 18 25 26 18 13 9 1,3 2,0 1,6

800 1015 1850 1950 4 15 31 50 60 46 32 24 9,1 4,0 2,3

800 1016 1850 1950 4 13 23 32 33 24 16 12 3,2 2,7 2,0

800 1017 1850 1950 6 18 32 43 46 34 23 17 9,1 4,0 2,7

800 1014 2450 2550 3 12 23 32 33 23 15 11 1,5 2,0 1,6800 1016 2450 2550 5 17 31 41 43 30 20 15 3,5 2,7 2,0

800 1017 2450 2550 8 23 42 56 60 43 29 22 10,3 4,0 2,7

900 1017 650 750 2 5 7 11 10 9 7 5 1,5 2,3 1,8

900 1018 650 750 4 9 14 23 29 23 18 14 15,3 6,0 3,0

900 1019 650 750 3 7 10 14 13 11 8 6 3,5 3,0 2,3

900 1020 650 750 4 9 13 19 19 14 11 9 9,4 4,5 3,0

900 1017 1250 1350 3 8 14 19 18 13 10 7 1,7 2,3 1,8

900 1018 1250 1350 5 15 27 38 50 40 29 22 19,1 6,0 3,0

900 1019 1250 1350 4 11 18 24 23 17 12 9 4,0 3,0 2,3

900 1020 1250 1350 6 15 24 32 32 24 17 13 10,8 4,5 3,0

900 1017 1850 1950 3 12 20 27 26 18 13 9 1,9 2,3 1,8

900 1018 1850 1950 7 21 39 53 60 57 39 29 22,9 6,0 3,0

900 1019 1850 1950 5 15 26 34 33 24 16 12 4,4 3,0 2,3

900 1020 1850 1950 8 20 35 45 46 34 23 17 12,2 4,5 3,0

900 1017 2450 2550 4 15 27 34 33 23 15 11 2,1 2,3 1,8

900 1018 2450 2550 9 26 51 60 60 60 50 37 26,7 6,0 3,0

900 1019 2450 2550 6 20 34 43 43 30 20 15 4,9 3,0 2,3

900 1020 2450 2550 10 26 45 58 60 43 29 22 13,6 4,5 3,0

1000 1019 650 750 3 7 12 20 21 16 13 10 6,5 4,0 2,5

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1000 1020 650 750 2 6 8 12 10 9 7 5 2,2 2,5 2,0

1000 1021 650 750 3 7 10 15 13 11 8 6 4,7 3,3 2,5

1000 1022 650 750 5 10 14 20 19 14 11 9 12,2 5,0 3,3

1000 1019 1250 1350 4 12 21 33 37 28 20 15 7,8 4,0 2,5

1000 1020 1250 1350 3 10 15 20 18 13 10 7 2,4 2,5 2,0

1000 1021 1250 1350 5 12 19 25 23 17 12 9 5,3 3,3 2,5

1000 1022 1250 1350 7 16 25 33 32 24 17 13 13,9 5,0 3,3

1000 1019 1850 1950 5 17 31 46 53 39 27 20 9,1 4,0 2,5

1000 1020 1850 1950 4 13 22 28 26 18 13 9 2,6 2,5 2,0

1000 1021 1850 1950 6 17 28 35 33 24 16 12 5,9 3,3 2,5

1000 1022 1850 1950 9 23 37 46 46 34 23 17 15,7 5,0 3,3

1000 1019 2450 2550 7 22 41 59 60 50 34 25 10,4 4,0 2,5

1000 1020 2450 2550 5 17 29 36 33 23 15 11 2,9 2,5 2,0

1000 1021 2450 2550 8 22 37 45 43 30 20 15 6,4 3,3 2,5

1000 1022 2450 2550 12 29 49 60 60 43 29 22 17,4 5,0 3,3

1100 1017 650 750 2 5 7 12 12 10 8 6 1,4 2,2 1,7

1100 1018 650 750 2 6 11 20 23 18 14 11 5,0 3,7 2,2

1100 1022 650 750 4 9 14 24 25 19 15 12 13,6 5,5 3,1

1100 1023 650 750 3 6 9 12 10 9 7 5 2,9 2,8 2,2

1100 1024 650 750 4 8 11 15 13 11 8 6 6,2 3,7 2,8

1100 1017 1250 1350 2 8 13 20 21 16 11 8 1,6 2,2 1,7

1100 1018 1250 1350 3 11 20 33 41 30 22 16 6,2 3,7 2,2

1100 1022 1250 1350 6 15 26 39 44 33 24 18 16,3 5,5 3,1

1100 1023 1250 1350 4 11 17 21 18 13 10 7 3,2 2,8 2,2

1100 1024 1250 1350 6 14 21 26 23 17 12 9 6,8 3,7 2,8

1100 1017 1850 1950 2 11 20 28 30 21 15 11 1,8 2,2 1,7

1100 1018 1850 1950 4 15 29 47 58 42 29 22 7,4 3,7 2,2

1100 1022 1850 1950 8 21 38 55 60 46 32 24 19,1 5,5 3,1

1100 1023 1850 1950 5 15 24 29 26 18 13 9 3,5 2,8 2,21100 1024 1850 1950 7 19 30 36 33 24 16 12 7,5 3,7 2,8

1100 1017 2450 2550 3 14 26 37 39 27 18 13 2,0 2,2 1,7

1100 1018 2450 2550 5 19 38 60 60 55 37 27 8,5 3,7 2,2

1100 1022 2450 2550 10 27 50 60 60 60 40 30 21,9 5,5 3,1

1100 1023 2450 2550 6 19 32 37 33 23 15 11 3,8 2,8 2,2

1100 1024 2450 2550 9 24 40 46 43 30 20 15 8,2 3,7 2,8

1200 1019 650 750 2 4 7 11 10 9 7 5 1,0 2,0 1,6

1200 1020 650 750 2 6 9 17 19 14 11 9 3,1 3,0 2,0

1200 1024 650 750 3 8 12 19 19 14 11 9 6,9 4,0 2,7

1200 1026 650 750 5 11 17 25 29 23 18 14 29,7 8,0 4,0

1200 1027 650 750 3 7 10 13 10 9 7 5 3,8 3,0 2,4

1200 1019 1250 1350 2 7 12 18 18 13 10 7 1,2 2,0 1,6

1200 1020 1250 1350 3 9 17 28 32 24 17 13 3,8 3,0 2,0

1200 1024 1250 1350 5 13 22 31 32 24 17 13 8,0 4,0 2,7

1200 1026 1250 1350 8 19 32 41 50 40 29 22 36,5 8,0 4,0

1200 1027 1250 1350 5 12 18 21 18 13 10 7 4,1 3,0 2,4

1200 1019 1850 1950 2 10 18 25 26 18 13 9 1,3 2,0 1,6

1200 1020 1850 1950 3 13 25 39 46 34 23 17 4,4 3,0 2,0

1200 1024 1850 1950 6 18 32 43 46 34 23 17 9,1 4,0 2,7

1200 1026 1850 1950 11 27 47 58 60 57 39 29 43,2 8,0 4,0

1200 1027 1850 1950 6 17 26 30 26 18 13 9 4,5 3,0 2,4

1200 1019 2450 2550 3 12 23 32 33 23 15 11 1,5 2,0 1,6

1200 1020 2450 2550 4 17 33 51 60 43 29 22 5,0 3,0 2,0

1200 1024 2450 2550 8 23 42 56 60 43 29 22 10,3 4,0 2,7

1200 1027 2450 2550 8 21 34 38 33 23 15 11 4,8 3,0 2,4

1300 1019 650 2 5 8 15 15 12 10 7 2,2 2,6 1,9

1300 1020 650 3 7 12 22 27 20 16 12 7,3 4,3 2,4

1300 1023 650 3 7 10 16 15 12 9 7 4,3 3,3 2,4

1300 1025 650 4 9 14 21 21 16 13 10 12,7 5,2 3,3

1300 1019 1250 2 9 16 24 27 20 14 11 2,6 2,6 1,9

1300 1020 1250 4 12 22 36 48 35 25 19 9,1 4,3 2,4

1300 1023 1250 4 11 19 26 26 19 14 10 4,9 3,3 2,4

1300 1025 1250 7 16 26 36 37 28 20 15 14,8 5,2 3,3

Width a

mm

Code


Resis-tance

number


number

Intake


number

OutletDLD DLDR 63 125 250 500 1000 2000 4000 8000

DLD/DLDR


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1300 1019 1850 3 12 23 34 39 28 19 14 3,0 2,6 1,9

1300 1020 1850 5 16 32 50 60 50 34 26 11,0 4,3 2,4

1300 1023 1850 5 16 28 36 37 26 18 13 5,4 3,3 2,4

1300 1025 1850 9 22 38 50 53 39 27 20 17,0 5,2 3,3

1300 1019 2450 4 15 30 44 50 36 24 18 3,4 2,6 1,9

1300 1020 2450 6 21 42 60 60 60 44 32 12,8 4,3 2,4

1300 1023 2450 7 21 36 47 48 34 23 17 6,0 3,3 2,4

1300 1025 2450 11 28 50 60 60 50 34 25 19,2 5,2 3,3

1400 1022 650 2 5 8 13 13 11 8 6 1,6 2,3 1,8

1400 1025 650 3 7 11 18 19 14 11 9 4,8 3,5 2,3

1400 1026 650 3 6 9 13 12 10 8 6 2,9 2,8 2,2

1400 1028 650 4 8 12 18 16 13 10 8 7,2 4,0 2,8

1400 1030 650 6 11 16 25 25 19 15 12 24,0 7,0 4,0

1400 1022 1250 2 8 14 22 23 17 12 9 1,9 2,3 1,8

1400 1025 1250 4 11 20 30 32 24 17 13 5,7 3,5 2,3

1400 1026 1250 4 10 17 22 21 16 11 8 3,3 2,8 2,2

1400 1028 1250 5 14 22 29 29 21 15 11 8,2 4,0 2,8

1400 1030 1250 9 19 31 42 44 33 24 18 28,5 7,0 4,0

1400 1022 1850 3 11 21 30 33 24 16 12 2,2 2,3 1,8

1400 1025 1850 5 16 29 42 46 34 23 17 6,5 3,5 2,3

1400 1026 1850 5 15 25 31 30 21 15 11 3,7 2,8 2,2

1400 1028 1850 7 19 32 41 41 30 20 15 9,2 4,0 2,8

1400 1030 1850 12 27 45 59 60 46 32 24 33,0 7,0 4,0

1400 1022 2450 3 14 27 39 43 30 20 15 2,4 2,3 1,8

1400 1025 2450 6 20 38 53 60 43 29 22 7,4 3,5 2,3

1400 1026 2450 6 19 32 40 39 27 18 13 4,0 2,8 2,2

1400 1028 2450 9 25 42 53 53 38 26 19 10,2 4,0 2,8

1500 1021 650 2 4 7 12 12 9 7 6 1,3 2,1 1,7

1500 1022 650 2 6 9 17 19 14 11 9 3,1 3,0 2,01500 1027 650 2 6 8 12 10 9 7 5 2,2 2,5 2,0

1500 1029 650 3 7 10 15 13 11 8 6 4,7 3,3 2,5

1500 1030 650 5 10 14 20 19 14 11 9 12,2 5,0 3,3

1500 1022 1250 3 9 17 28 32 24 17 13 3,8 3,0 2,0

1500 1027 1250 3 10 15 20 18 13 10 7 2,4 2,5 2,0

1500 1029 1250 5 12 19 25 23 17 12 9 5,3 3,3 2,5

1500 1030 1250 7 16 25 33 32 24 17 13 13,9 5,0 3,3

1500 1021 1850 2 10 19 28 29 21 14 10 1,7 2,1 1,7

1500 1022 1850 3 13 25 39 46 34 23 17 4,4 3,0 2,0

1500 1027 1850 4 13 22 28 26 18 13 9 2,6 2,5 2,0

1500 1029 1850 6 17 28 35 33 24 16 12 5,9 3,3 2,5

1500 1030 1850 9 23 37 46 46 34 23 17 15,7 5,0 3,3

1500 1021 2450 3 13 25 35 38 26 18 13 1,9 2,1 1,7

1500 1022 2450 4 17 33 51 60 43 29 22 5,0 3,0 2,0

1500 1027 2450 5 17 29 36 33 23 15 11 2,9 2,5 2,0

1500 1029 2450 8 22 37 45 43 30 20 15 6,4 3,3 2,5

1500 1030 2450 12 29 49 60 60 43 29 22 17,4 5,0 3,3

1600 1023 650 2 4 7 11 10 9 7 5 1,0 2,0 1,6

1600 1024 650 2 5 9 15 16 13 10 8 2,3 2,7 1,9

1600 1025 650 2 7 11 21 25 19 15 12 6,1 4,0 2,3

1600 1032 650 4 9 12 17 15 12 9 7 7,5 4,0 2,9

1600 1023 1250 2 7 12 18 18 13 10 7 1,2 2,0 1,6

1600 1024 1250 3 9 16 25 28 21 15 11 2,8 2,7 1,9

1600 1025 1250 3 11 21 36 44 33 24 18 7,6 4,0 2,3

1600 1032 1250 6 14 22 28 26 19 14 10 8,4 4,0 2,9

1600 1023 1850 2 10 18 25 26 18 13 9 1,3 2,0 1,6

1600 1024 1850 3 12 23 35 40 29 20 15 3,2 2,7 1,9

1600 1025 1850 4 15 31 50 60 46 32 24 9,1 4,0 2,3

1600 1032 1850 8 20 32 39 37 26 18 13 9,3 4,0 2,9

1600 1023 2450 3 12 23 32 33 23 15 11 1,5 2,0 1,6

1600 1024 2450 4 16 31 45 52 37 25 18 3,6 2,7 1,9

1600 1025 2450 5 20 40 60 60 60 40 30 10,6 4,0 2,3

1600 1032 2450 10 26 42 50 48 34 23 17 10,2 4,0 2,9

Width a

mm

Code


Resis-tance

number


number

Intake


number

OutletDLD DLDR 63 125 250 500 1000 2000 4000 8000

DLD/DLDR


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1800 1026 650 2 5 7 13 13 10 8 6 1,5 2,3 1,7

1800 1033 650 4 10 15 24 27 20 16 12 16,2 6,0 3,3

1800 1035 650 4 9 13 19 19 14 11 9 9,4 4,5 3,0

1800 1036 650 3 7 10 13 10 9 7 5 3,8 3,0 2,4

1800 1026 1250 2 8 14 21 22 16 12 9 1,7 2,3 1,7

1800 1033 1250 6 16 27 40 48 35 25 19 19,7 6,0 3,3

1800 1035 1250 6 15 24 32 32 24 17 13 10,8 4,5 3,0

1800 1036 1250 5 12 18 21 18 13 10 7 4,1 3,0 2,4

1800 1026 1850 3 11 20 29 31 22 15 11 1,9 2,3 1,7

1800 1033 1850 8 22 40 56 60 50 34 26 23,2 6,0 3,3

1800 1035 1850 8 20 35 45 46 34 23 17 12,2 4,5 3,0

1800 1036 1850 6 17 26 30 26 18 13 9 4,5 3,0 2,4

1800 1026 2450 3 14 26 38 41 28 19 14 2,2 2,3 1,7

1800 1033 2450 11 29 53 60 60 60 44 32 26,6 6,0 3,3

1800 1035 2450 10 26 45 58 60 43 29 22 13,6 4,5 3,0

1800 1036 2450 8 21 34 38 33 23 15 11 4,8 3,0 2,4

2000 1027 650 2 4 7 11 10 9 7 5 1,0 2,0 1,6

2000 1029 650 2 6 10 18 21 16 13 10 4,0 3,3 2,1

2000 1032 650 2 6 9 14 13 11 8 6 2,5 2,7 2,0

2000 1033 650 3 7 12 20 21 16 13 10 6,5 4,0 2,5

2000 1039 650 5 10 14 20 19 14 11 9 12,2 5,0 3,3

2000 1027 1250 2 7 12 18 18 13 10 7 1,2 2,0 1,6

2000 1029 1250 3 10 19 31 37 27 20 15 4,9 3,3 2,1

2000 1032 1250 3 9 16 23 23 17 12 9 2,8 2,7 2,0

2000 1033 1250 4 12 21 33 37 28 20 15 7,8 4,0 2,5

2000 1039 1250 7 16 25 33 32 24 17 13 13,9 5,0 3,3

2000 1027 1850 2 10 18 25 26 18 13 9 1,3 2,0 1,6

2000 1029 1850 4 14 27 43 52 38 26 20 5,8 3,3 2,1

2000 1032 1850 4 13 23 32 33 24 16 12 3,2 2,7 2,02000 1033 1850 5 17 31 46 53 39 27 20 9,1 4,0 2,5

2000 1039 1850 9 23 37 46 46 34 23 17 15,7 5,0 3,3

2000 1027 2450 3 12 23 32 33 23 15 11 1,5 2,0 1,6

2000 1029 2450 5 18 36 55 60 49 33 24 6,7 3,3 2,1

2000 1032 2450 5 17 31 41 43 30 20 15 3,5 2,7 2,0

2000 1033 2450 7 22 41 59 60 50 34 25 10,4 4,0 2,5

2000 1039 2450 12 29 49 60 60 43 29 22 17,4 5,0 3,3

2200 1031 650 2 5 7 12 12 10 8 6 1,4 2,2 1,7

2200 1033 650 2 6 11 20 23 18 14 11 5,0 3,7 2,2

2200 1036 650 3 8 13 23 26 19 16 12 10,1 4,9 2,8

2200 1038 650 3 7 10 15 14 11 9 7 3,9 3,1 2,3

2200 1040 650 3 6 9 12 10 9 7 5 2,9 2,8 2,2

2200 1042 650 4 8 11 15 13 11 8 6 6,2 3,7 2,8

2200 1031 1250 2 8 13 20 21 16 11 8 1,6 2,2 1,7

2200 1033 1250 3 11 20 33 41 30 22 16 6,2 3,7 2,2

2200 1036 1250 5 13 24 38 45 34 24 18 12,3 4,9 2,8

2200 1038 1250 4 11 18 25 25 18 13 10 4,5 3,1 2,3

2200 1040 1250 4 11 17 21 18 13 10 7 3,2 2,8 2,2

2200 1042 1250 6 14 21 26 23 17 12 9 6,8 3,7 2,8

2200 1031 1850 2 11 20 28 30 21 15 11 1,8 2,2 1,7

2200 1033 1850 4 15 29 47 58 42 29 22 7,4 3,7 2,2

2200 1036 1850 6 19 35 53 60 48 33 24 14,5 4,9 2,8

2200 1038 1850 5 16 27 35 35 25 17 13 5,0 3,1 2,3

2200 1040 1850 5 15 24 29 26 18 13 9 3,5 2,8 2,2

2200 1042 1850 7 19 30 36 33 24 16 12 7,5 3,7 2,8

2200 1031 2450 3 14 26 37 39 27 18 13 2,0 2,2 1,7

2200 1033 2450 5 19 38 60 60 55 37 27 8,5 3,7 2,2

2200 1036 2450 8 24 46 60 60 60 41 31 16,8 4,9 2,8

2200 1038 2450 6 20 35 45 46 32 22 16 5,5 3,1 2,3

2200 1040 2450 6 19 32 37 33 23 15 11 3,8 2,8 2,2

2200 1042 2450 9 24 40 46 43 30 20 15 8,2 3,7 2,8

Width a

mm

Code


Resis-tance

number


number

Intake


number

OutletDLD DLDR 63 125 250 500 1000 2000 4000 8000

DLD/DLDR


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Rectangular straight silencer DLDY

DescriptionDLDY is fitted with built-in side baffles located outside thefitting dimensions. The products can be manufactured in allstandard duct sizes.

Design

DLDY has an external shell of trapezoidal corrugated sheetfor stability and reduced risk of natural oscillation.DLDY is designed for low air resistance with baffle combina-tions that dampen particularly low-frequency noise well.The type of insulation material is Lindtec which has beendeveloped to provide good noise properties, low weight and

to be cleanable.

DLDY meets the requirements of air tightness class C andpressure class 2 according to EN 1507:2006.DLDY is equipped with joining profile type RJFP.


The software DIMsilencer is recommended for fast choise ofsilencer or a complete and fast sound calculation of the ductsystem.The software CADvent offers dimensioning in an environ-ment with 3D-modelling.Computorised planning can be conducted with automaticpresentation of noise levels, pressure drop etc.

Dimensions

If alternative material is required, this shall be stated whenordering, e.g. aluminium zinc (AZ185) and stainless acid-proof steel.The silencer is also available with the following accessories/options.

TRA = Non-insulated inspection hatch.

TRB = Hatch intended for external insulation.*

TRC = Hatch intended for external insulation.*

TP = Absorbent covered with perforated sheet.

AIA = 50 mm fire protection insulation.Note! b measure increases by 100 mm.

AIB = 100 mm fire protection insulation.Note! b measure increases by 200 mm.

The dimension of the hatches is adapted for cleaning andinspection of all baffle spacings.Manual dimensioning see page 38.

* Specify insulation thickness when ordering.

a

a + 200

b

l

50

50

Ordering example

DLDY 800 600 750 2015 TRA

Product

Width height a b

Length l

Code

Accessories



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Manual designing for DLDYA number of silencers can be designed manually, for more combinations of silencers and faster calculations use DIMsilencer.

Manual method of calculation is shown below:

A Specify connection dimensions and flow-type location of the silencer.

B Specify the sound power level before the silencer.

Read the insertion attenuation from the tables on page 174.Calculate the sound power level after the silencer irrespective of the air flow (selv generated noise).


C Determine the pressure drop with help of the graph on page 171and table on page 172.In this case we have straight ducts before and after the silencer.

Pressure drop

D Determine the self generated noise from the silencer at present air flow.Calculate the sound power level after the silencer inclusive the self generated noise.


Width 800 mm

Heigh 1000 mm

Length 1350 mm

Location Exhaust air

DLDY-800-1000-1350-2016


Resis-

tance

number

Self gene-

rated noise

number inlet

Sound power level

before silencer72 73 73 64 62 59 52 44

Attenuation from

table page 1743 11 19 31 35 26 19 14 2,8 2,7

Sound power level

after silencer withoutself generated noise

69 62 54 33 27 33 33 30

Area 0,8 m Air flow 400 l/s


velocity

Air velocity5 m/s

Pressure drop42 Pa

Correction at disturbance according table on page 172 Factor1

Pressure drop

after correction42 Pa



and air velocity59 55 54 51 48 45 41 35

Correction for gross cross section area -1 -1 -1 -1 -1 -1 -1 -1

Self generated noise 58 54 53 50 47 44 40 34

Sound power level after the silencer 59 63 57 50 47 44 41 35


http://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdf


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e o ow ng ta e can e use or own manuacalculations in accordance with the example on the previous page.

Designing table for DLDY


Pressure drop


With mm

Height mm

Length mm

Location

63 Hz 125 Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz 8000HzResistance

number

Self gene-

rated noise

number inlet

Sound power level

before silencer

Attenuation from

table page 174

Sound power level

after silencer without

self generated noise

Area m Air flow l/s


velocity

Air velocitym/s

Pressure dropPa

Correction at disturbance according table on page 172 Factor Pressure drop

after correctionPa



and air velocity

Correction for gross cross section area


Sound power level after the silencer

http://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdf


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Pressure dropFollow the directions below and the adjoining graph.

Calculate the gross cross section area a b in m.

Go horizontal in the graph to the present air flow, l/s.

Go up to the resistance number achieved from the tableson page 174.

Read the pressue drop over the silencer, at straight ductconnection before and after the silencer, (factor 1,0). Forother modes of connection see the table for correction onpage 172.

Air flow velocity, which is used at the calculation of theself generated noise, can be read here.

1

2

3

4

5

4 5 6 7 8321 9 10

5

4

3

2

0,1

0,2

0,3

0,4

0,5

1

1,5

v [m/s]

Ac[m]

200

150

10

15

20

30

40

50

60

708090

100

pt[Pa]

1

5

2

3

4

R

30

20

15

10

8

6

4

3

2

1,5

1

30000200001500010000

60004000

3000200015001000

600400300

200150

q [l/s]
http://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdf


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Tryckfall

Aktuellt tryckfall = Avlst tryckfall nedanstende faktor.

D = Ljuddmparens strsta anslutningssida (a eller b).

Tabellen omfattar ett urval av de vanligaste frekommande strningsfallen.

Logaritmisk addition

3D 2D 1D 0D 0D 1D 2D 3D

Duct

Duct

Duct

Duct

Duct branch

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Bend

Duct

Duct

Duct

Duct

Duct

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

Silencer

1,0

1,1

1,2

1,4

1,5

1,2

1,3

1,3

1,4

1,5

1,6

1,7

1,8

1,9

2,0

2,0Ka mmar

am mare 3,0

Ka mmar am mare 3,5

Bend

Chamber

Chamber

ChamberChamber

Before the silencer

Distance before the silencer Distance after the silencer

Silencer After the silencer

Factor

[dB]

[dB]

Increamenttoaddto

thehighestdB-value

3

2

1

0

0 5 8 10Difference between dB-valuesto be added

15 20


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Self generated noise per frequence bandDecide from the location of the silencer whether it is thesupply or exhaust graph that shall be used. (Rule of mem-ory - the side that leads away from the fan, i.e. at supplyair the outlet graph is used and at exhaust air the in-takegraph.)

Go horizontally into the present graph, at present air ve-locity, to the self generated noise number.

Then go vertically up to the crossing of the different fre-quency band lines.

Read the self generated noise, at gross cross section area1 m, for each frequency band straight out to the left. Inthe example only the 8000 Hz-reading is shown.

Add or subtract the correction for the present gross crosssection area.

Sound power level after the silencerThe sound power level after the silencer can be calculated for

all frequences by a logarithmical addition of:

"The self generated noise" and "The sound power level

before the silencer".

The shown example gives at 8000 Hz:

Self generated noise = 35 dB - 1 dB = 34 dB

Sound power level before the silencer - the attenuation:

44 dB - 14 dB = 30 dB

Logarithmic addition of 34 and 30 = 35 dB

(See graph for logarithmical addition on page 172.)

- 10,0

0,0 10,0

- 10,0

0,0 10,0

Self generated noise in intake DLD/DLDR/DLDY Self generated noise in outlet DLD/DLDR/DLDY

Self

generatednoiseatgrosscrosssectionarea1

m

(Correctionfactortootherareaaccordingtoabove.)

Airvelocity

(Velocityo

vergrosscrosssectionarea.)

Airvelocity

(Velocityo

vergrosscrosssectionarea.)

Selfgener

atednoiseatgrosscrosssectionarea1m

(Correctio

nfactortootherareaaccordingtoabove.)

Correction for gross cross section area:a b in m: 1 2 3 80,1

-10

0,4

-7

0,8

-4 -1 0 +3 +6

10

+9 +10

0,2Correction for gross cross section area:a b in m: 1 2 3 80,1

-10

0,4

-7

0,8

-4 -1 0 +3 +6

10

+9 +10

0,2

dB(A)

63 Hz

125 Hz250 Hz

500 Hz

1 kHz

2 kHz

4 kHz 8 kHz

1,5

2

3

4

5 6 7 8 9 10

10 m/s

5 m/s

3m/s

2 m/s

5 m/s

3m/s

2 m/s

10 m/s

70 dB

60 dB

50 dB

40 dB

30 dB 30 dB

70 dB

60 dB

50 dB

40 dB

dB(A)

63 Hz

125 Hz

250 Hz

500 Hz

1 kHz

2 kHz 4 kHz 8 kHz

1,5

2

3

4

5 6 7 8 9 10



10

98

7

6

Outdoor air

Extract air

Supplyair

Exhaustair

OutletRoom

Intake

Out-

doors

Fan

Fan IntakeOutlet

7

8

9

10
http://../AirDuctSystems/DLDYManualDesigning.pdfhttp://../AirDuctSystems/DLDYManualDesigning.pdf


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Width a

mm

Code Length l

mm

Static insertion attenuation / octave band [dB]

Resis-tance

number


number

Intake


number

Outlet63 125 250 500 1000 2000 4000 8000400 2009 750 2 5 9 18 21 16 13 10 1,0 2,0 1,6

400 2010 750 3 7 11 23 26 20 16 12 2,5 2,7 2,0

400 2009 1350 2 9 16 30 36 27 19 14 1,2 2,0 1,6

400 2010 1350 4 12 21 38 46 34 25 19 2,8 2,7 2,0

400 2009 1950 3 12 24 43 51 38 26 19 1,3 2,0 1,6

400 2010 1950 5 16 31 53 60 49 33 25 3,2 2,7 2,0

500 2012 750 2 5 9 17 17 13 10 8 1,1 2,0 1,7

500 2013 750 3 7 11 20 21 16 13 10 2,2 2,5 2,0

500 2014 750 4 9 14 25 26 20 16 12 4,7 3,3 2,5

500 2012 1350 3 9 16 28 29 22 16 12 1,2 2,0 1,7

500 2013 1350 4 12 20 34 36 27 19 14 2,4 2,5 2,0

500 2014 1350 6 15 26 41 46 34 25 19 5,3 3,3 2,5

500 2012 1950 4 13 24 39 42 31 21 16 1,3 2,0 1,7

500 2013 1950 5 16 30 47 51 38 26 19 2,6 2,5 2,0500 2014 1950 8 21 38 58 60 49 33 25 5,9 3,3 2,5

600 2012 750 2 6 11 22 28 21 17 13 3,1 3,0 2,0

600 2013 750 2 5 7 13 12 10 8 6 0,6 1,7 1,5

600 2015 750 2 6 9 15 14 11 9 7 1,1 2,0 1,7

600 2016 750 3 7 11 18 17 13 10 8 2,0 2,4 2,0

600 2017 750 4 9 13 22 21 16 13 10 3,8 3,0 2,4

600 2012 1350 3 11 20 36 49 36 26 19 3,8 3,0 2,0

600 2013 1350 2 8 14 22 22 16 12 9 0,7 1,7 1,5

600 2015 1350 3 10 16 25 25 18 13 10 1,2 2,0 1,7

600 2016 1350 4 12 20 30 29 22 16 12 2,2 2,4 2,0

600 2017 1350 6 15 24 36 36 27 19 14 4,1 3,0 2,4

600 2012 1950 4 15 30 50 60 51 35 26 4,4 3,0 2,0

600 2013 1950 3 11 20 30 31 22 15 11 0,7 1,7 1,5

600 2015 1950 4 14 24 36 36 26 18 13 1,3 2,0 1,7600 2016 1950 6 17 29 42 42 31 21 16 2,4 2,4 2,0

600 2017 1950 8 21 35 50 51 38 26 19 4,5 3,0 2,4

700 2012 750 2 5 9 18 20 15 12 9 1,6 2,3 1,8

700 2013 750 3 8 12 23 28 21 17 13 4,8 3,5 2,3

700 2016 750 3 6 9 14 12 10 8 6 1,1 2,0 1,8

700 2017 750 3 7 10 16 14 11 9 7 1,9 2,3 2,0

700 2012 1350 3 9 17 30 35 26 19 14 1,9 2,3 1,8

700 2013 1350 4 13 23 38 49 36 26 19 5,7 3,5 2,3

700 2016 1350 4 10 16 24 22 16 12 9 1,2 2,0 1,8

700 2017 1350 5 12 19 27 25 18 13 10 2,0 2,3 2,0

700 2012 1950 3 12 24 41 50 36 25 19 2,2 2,3 1,8

700 2013 1950 6 18 34 53 60 51 35 26 6,5 3,5 2,3

700 2016 1950 5 14 24 33 31 22 15 11 1,3 2,0 1,8

700 2017 1950 6 17 28 38 36 26 18 13 2,2 2,3 2,0

800 2016 750 2 6 10 19 20 15 12 9 2,5 2,7 2,0

800 2017 750 4 9 14 24 28 21 17 13 6,9 4,0 2,7

800 2019 750 3 6 9 13 11 9 7 5 1,2 2,0 1,8

800 2016 1350 3 11 19 31 35 26 19 14 2,8 2,7 2,0

800 2017 1350 6 15 26 40 49 36 26 19 8,0 4,0 2,7

800 2019 1350 4 11 16 22 19 14 10 8 1,2 2,0 1,8

800 2016 1950 4 15 28 44 50 36 25 19 3,2 2,7 2,0

800 2017 1950 7 20 37 56 60 51 35 26 9,1 4,0 2,7

800 2019 1950 5 15 24 31 27 19 13 10 1,3 2,0 1,8

800 2016 2550 5 19 36 56 60 47 31 23 3,5 2,7 2,0

800 2017 2550 9 26 49 60 60 60 44 33 10,3 4,0 2,7

800 2019 2550 6 19 31 40 35 24 16 12 1,4 2,0 1,8

900 2015 750 2 4 7 13 13 10 8 6 0,7 1,8 1,5

900 2017 750 2 6 9 15 15 12 10 7 1,5 2,3 1,8

900 2019 750 3 7 11 20 20 15 12 9 3,5 3,0 2,3

900 2020 750 4 10 15 25 28 21 17 13 9,4 4,5 3,0

900 2015 1350 2 7 13 21 22 16 12 9 0,8 1,8 1,5

900 2017 1350 3 9 16 26 27 20 14 11 1,7 2,3 1,8


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900 2019 1350 4 12 21 33 35 26 19 14 4,0 3,0 2,3

900 2020 1350 7 16 28 41 49 36 26 19 10,8 4,5 3,0

900 2015 1950 2 10 19 29 32 23 16 12 0,9 1,8 1,5

900 2017 1950 4 13 24 36 39 28 19 14 1,9 2,3 1,8

900 2019 1950 6 17 30 46 50 36 25 19 4,4 3,0 2,3

900 2020 1950 9 23 41 58 60 51 35 26 12,2 4,5 3,0

900 2015 2550 3 13 24 38 41 29 19 14 1,0 1,8 1,5

900 2017 2550 4 17 31 46 50 36 24 18 2,1 2,3 1,8

900 2019 2550 7 22 40 59 60 47 31 23 4,9 3,0 2,3

900 2020 2550 11 30 53 60 60 60 44 33 13,6 4,5 3,0

1000 2015 750 1 4 6 11 11 9 7 5 0,5 1,7 1,4

1000 2018 750 2 5 8 13 13 10 8 6 1,1 2,0 1,7

1000 2020 750 3 6 10 16 15 12 10 7 2,2 2,5 2,0

1000 2021 750 4 8 12 20 20 15 12 9 4,7 3,3 2,5

1000 2022 750 5 11 16 25 28 21 17 13 12,2 5,0 3,3

1000 2015 1350 2 6 11 18 19 14 10 7 0,6 1,7 1,4

1000 2018 1350 3 8 14 22 22 16 12 9 1,2 2,0 1,7

1000 2020 1350 4 11 18 27 27 20 14 11 2,4 2,5 2,0

1000 2021 1350 5 14 23 34 35 26 19 14 5,3 3,3 2,5

1000 2022 1350 8 18 30 42 49 36 26 19 13,9 5,0 3,3

1000 2015 1950 2 9 17 26 27 19 13 10 0,7 1,7 1,4

1000 2018 1950 3 12 21 31 32 23 16 12 1,3 2,0 1,7

1000 2020 1950 5 15 26 38 39 28 19 14 2,6 2,5 2,0

1000 2021 1950 7 19 33 47 50 36 25 19 5,9 3,3 2,5

1000 2022 1950 11 25 44 59 60 51 35 26 15,7 5,0 3,3

1000 2015 2550 2 12 22 33 35 24 16 12 0,7 1,7 1,4

1000 2018 2550 4 15 28 40 41 29 19 14 1,4 2,0 1,7

1000 2020 2550 6 19 34 49 50 36 24 18 2,9 2,5 2,0

1000 2021 2550 9 25 44 60 60 47 31 23 6,4 3,3 2,5

1000 2022 2550 14 33 57 60 60 60 44 33 17,4 5,0 3,3

1100 2018 750 2 7 12 22 29 22 17 13 5,0 3,7 2,2

1100 2019 750 2 5 7 12 11 9 7 5 0,8 1,8 1,6

1100 2021 750 2 6 9 14 13 10 8 6 1,5 2,2 1,8

1100 2023 750 3 7 10 17 15 12 10 7 2,9 2,8 2,2

1100 2024 750 4 9 13 21 20 15 12 9 6,2 3,7 2,8

1100 2018 1350 3 11 22 36 50 38 27 20 6,2 3,7 2,2

1100 2019 1350 2 8 13 20 19 14 10 7 0,9 1,8 1,6

1100 2021 1350 3 10 16 23 22 16 12 9 1,6 2,2 1,8

1100 2023 1350 5 12 19 28 27 20 14 11 3,2 2,8 2,2

1100 2024 1350 6 15 24 35 35 26 19 14 6,8 3,7 2,8

1100 2018 1950 4 16 32 50 60 53 37 27 7,4 3,7 2,2

1100 2019 1950 3 11 19 27 27 19 13 10 1,0 1,8 1,6

1100 2021 1950 4 13 23 32 32 23 16 12 1,8 2,2 1,8

1100 2023 1950 6 17 28 39 39 28 19 14 3,5 2,8 2,2

1100 2024 1950 9 21 36 49 50 36 25 19 7,5 3,7 2,8

1100 2018 2550 5 20 42 60 60 60 46 34 8,5 3,7 2,2

1100 2019 2550 3 14 25 35 35 24 16 12 1,0 1,8 1,6

1100 2021 2550 5 17 31 42 41 29 19 14 1,9 2,2 1,8

1100 2023 2550 7 22 37 50 50 36 24 18 3,8 2,8 2,2

1100 2024 2550 11 27 47 60 60 47 31 23 8,2 3,7 2,8

1200 2023 750 2 5 8 12 11 9 7 5 1,1 2,0 1,7

1200 2024 750 4 8 13 23 25 19 15 11 6,9 4,0 2,7

1200 2025 750 3 7 9 14 13 10 8 6 2,0 2,4 2,0

1200 2027 750 4 8 11 17 15 12 10 7 3,8 3,0 2,4

1200 2023 1350 3 9 14 20 19 14 10 7 1,2 2,0 1,7

1200 2024 1350 5 14 24 39 43 32 23 17 8,0 4,0 2,7

1200 2025 1350 4 11 17 24 22 16 12 9 2,2 2,4 2,0

1200 2027 1350 5 13 21 29 27 20 14 11 4,1 3,0 2,4

1200 2023 1950 4 12 21 29 27 19 13 10 1,3 2,0 1,7

1200 2024 1950 7 20 36 54 60 45 31 23 9,1 4,0 2,7

1200 2025 1950 5 15 25 34 32 23 16 12 2,4 2,4 2,0

Width a

mm

Code Length l

mm

Static insertion attenuation / octave band [dB]

Resis-tance

number


number

Intake


number

Outlet63 125 250 500 1000 2000 4000 8000


45/63



1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18


1200 2027 1950 7 19 31 40 39 28 19 14 4,5 3,0 2,4

1200 2023 2550 4 16 28 37 35 24 16 12 1,4 2,0 1,7

1200 2024 2550 9 25 47 60 60 59 39 29 10,3

lindab rectangular

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