Volume Control Damper

Identification* NF/VCD

FRONT VIEW

S T A NDA R D C ONS T R UC T ION

Frame:0.7 - 1.2mm galvanized steel channel provides greaterrigidity and strength.

Blade:Max. 6" spacing galvanized steel 0.7 - 1.0mm design for more strength and overlap coverage. Max. Length = 48".

Linkage:Type NF / VCD formed brackets of 0.7 - 1.0mm galvanized steel.

Bearings:Washer sleeve bearing.

Axles:5/16", 3/8", 1/2" galvanized steel

Sizes:Made to exact size as required.

Dampers less than 9"H made with 3/4" x 3" x 3/4" channel frame.

Hand Quadrant:For manual operation.

Type Of Joint:S&D or TDC joint.

W

H

L

Ø

Volume Control Damper

Identification* NF/VCD

SIDE VIEW

V A R IA T IONS F E A T UR E S

1. Drive Shafts: a. Extendable to 6" beyond frame. b. More than 8" using exterior bearing support.

2. Wider Frames: Frames wider than 4". 3. Axles: Stainless steel.

4. Seals Also available with neoprene side.

5. Bearings: Copper / Bronze sleeze bearing.

6" Max.

Axles 5/16", 3/8", 1/2"Ø

NF / VCD OPPOSED BLADES TYPE

NAM FOONG (M) SDN BHD (8070-T)

ACOUSTIC AND AIRFLOW PERFORMANCE TEST OF VOLUME CONTROL DAMPER

SUPPLIED BY : NAM FOONG (M) SDN BHD (8070-T)TESTED BY : VIPAC ENGINEERS & SCIENTISTS LTDTEST DATE : 30/9/99CLIENT : NAM FOONG (M) SDN BHD (8070-T)UNIT : Volume Control Damper

Size : 610mm x 610mm Neck (To Fit Nominal 24" x 24" Duct)Damper Position : FULLY OPEN

TEST CONDITIONS SOUND POWER LEVEL, dB re 1E-12 WOCTAVE BAND CENTRE FREQUENCY (Hz)

Qs 125 250 500 1000 2000 4000 8000(l/s)

760 <47.0 <36.5 <29.8 26.6 23.5 <18.3 <18.0900 <47.3 <37.6 <32.2 30.8 27.7 21.3 <19.31270 <50.3 43.4 40.9 38.6 35.8 30.4 26.11610 54.1 49.3 47.5 44.7 42.1 37.5 33.72070 59.8 54.8 54.7 50.7 47.5 43.4 39.6

ACOUSTIC AND AIRFLOW PERFORMANCE TEST OF VOLUME CONTROL DAMPER

SUPPLIED BY : NAM FOONG (M) SDN BHD (8070-T)TESTED BY : VIPAC ENGINEERS & SCIENTISTS LTDTEST DATE : 30/9/99CLIENT : NAM FOONG (M) SDN BHD (8070-T)UNIT : Volume Control Damper

Size : 610mm x 610mm Neck (To Fit Nominal 24" x 24" Duct)Damper Position : CLOSE 1

TEST CONDITIONS SOUND POWER LEVEL, dB re 1E-12 WOCTAVE BAND CENTRE FREQUENCY (Hz)

Qs 125 250 500 1000 2000 4000 8000(l/s)

760 <48.1 <38.6 <31.0 26.5 21.3 <16.6 <17.6900 <49.1 <39.4 35.1 32.1 26.9 19.3 <18.61180 <51.2 44.7 42.5 39.3 34.5 26.9 <21.81470 56.1 50.2 48.7 44.8 40.6 34.2 29.31870 62.3 55.7 55.4 51.1 46.7 40.0 33.6

LEGEND

Qs - Primary Air Flow Rate (l/s)Ps - Supply Static Pressure (Pa)< - Insufficient margin above background noise to allow accurate determination

Ps(Pa)

79172641

Ps(Pa)

1319304572

NAM FOONG (M) SDN BHD (8070-T)

ACOUSTIC AND AIRFLOW PERFORMANCE TEST OF VOLUME CONTROL DAMPER

SUPPLIED BY : NAM FOONG (M) SDN BHD (8070-T)TESTED BY : VIPAC ENGINEERS & SCIENTISTS LTDTEST DATE : 30/9/99CLIENT : NAM FOONG (M) SDN BHD (8070-T)UNIT : Volume Control Damper

Size : 610mm x 610mm Neck (To Fit Nominal 24" x 24" Duct)Damper Position : CLOSE 2

TEST CONDITIONS SOUND POWER LEVEL, dB re 1E-12 WOCTAVE BAND CENTRE FREQUENCY (Hz)

Qs 125 250 500 1000 2000 4000 8000(l/s)

680 <46.7 <38.0 <32.7 27.2 19.9 <15.3 <17.2810 <48.9 <41.2 39.3 33.9 28.6 23.0 <20.4960 <51.2 45.8 45.1 40.1 33.4 24.4 <19.41180 55.1 50.3 50.6 45.9 39.9 31.8 22.91420 60.0 54.1 55.0 51.2 45.8 38.4 29.7

ACOUSTIC AND AIRFLOW PERFORMANCE TEST OF VOLUME CONTROL DAMPER

SUPPLIED BY : NAM FOONG (M) SDN BHD (8070-T)TESTED BY : VIPAC ENGINEERS & SCIENTISTS LTDTEST DATE : 30/9/99CLIENT : NAM FOONG (M) SDN BHD (8070-T)UNIT : Volume Control Damper

Size : 610mm x 610mm Neck (To Fit Nominal 24" x 24" Duct)Damper Position : CLOSE 3

TEST CONDITIONS SOUND POWER LEVEL, dB re 1E-12 WOCTAVE BAND CENTRE FREQUENCY (Hz)

Qs 125 250 500 1000 2000 4000 8000(l/s)

570 <47.2 <39.1 34.8 28.6 20.9 <15.2 <17.1670 <49.2 <41.4 40.9 34.7 27.6 <17.8 <17.4810 <51.2 45.9 46.7 41.1 34.1 24.6 <18.8985 54.5 50.0 51.7 47.4 40.9 32.2 22.21160 59.4 53.6 55.4 52.4 47.1 38.7 29.3

LEGEND

Qs - Primary Air Flow Rate (l/s)Ps - Supply Static Pressure (Pa)< - Insufficient margin above background noise to allow accurate determination

Ps(Pa)

2030436184

Ps(Pa)

2434486993

NAM FOONG (M) SDN BHD (8070-T)

ACOUSTIC AND AIRFLOW PERFORMANCE TEST OF VOLUME CONTROL DAMPER

SUPPLIED BY : NAM FOONG (M) SDN BHD (8070-T)TESTED BY : VIPAC ENGINEERS & SCIENTISTS LTDTEST DATE : 30/9/99CLIENT : NAM FOONG (M) SDN BHD (8070-T)UNIT : Volume Control Damper

Size : 610mm x 610mm Neck (To Fit Nominal 24" x 24" Duct)Damper Position : CLOSE 4

TEST CONDITIONS SOUND POWER LEVEL, dB re 1E-12 WOCTAVE BAND CENTRE FREQUENCY (Hz)

Qs 125 250 500 1000 2000 4000 8000(l/s)

570 <48.9 <41.1 39.7 33.4 26.7 <17.1 <17.3670 <50.8 44.5 45.4 40.4 34.1 23.9 <18.0800 54.3 48.8 50.5 46.7 40.5 31.4 <21.5980 58.0 52.9 54.8 52.0 47.0 38.5 28.5

LEGEND

Qs - Primary Air Flow Rate (l/s)Ps - Supply Static Pressure (Pa)< - Insufficient margin above background noise to allow accurate determination

6896

Ps(Pa)

3448

NAM FOONG (M) SDN BHD (8070-T) ______________________________________________________________________________________

PERFORMANCE NOTES • Units are tested accordance with the Air Diffusion Council (USA) Equipment

Test Code 1062 : GRD-84. Measurements were taken in general accordance with the following standards :-

ACOUSTICS International Standard ISO 3741 Clause 8.3 (Method 11) “Acoustics – Determination of Sound Power Levels of Noise Sources – Precision Methods for Broad-Band Sources in Reverberation Rooms”. AIRFLOW Air Diffusion Council (USA) Equipment Test Code 1062 : GRD-84. THROW AND STATIC PRESSURE DROP

Air Diffusion Council (USA) Equipment Test Code 1062 : GRD-84. TEST SET UP AND PROCEDURE Reverberation Test Room has a volume of 170m3 has been qualified in accordance with the procedures in ISO 3741 for determination of sound power in octave bands with Centre Frequencies from 125 Hz to 8000 Hz. The Units under test were set up in the Air Distribution (Reverberation) Test Chamber and connected to a quiet air supply. The units were supplied with ambient temperature air at the specified airflow. The environmental test conditions in the reverberation chamber varied for each test within the following ranges : - Test Air Temperature 18 degrees C ± 2.0 degree C Room Air Temperature 20 degrees C ± 2.0 degree C Barometric Pressure 1040 millibar ± 5 millibar Relative Humidity 60 ± 10%

NAM FOONG (M) SDN BHD (8070-T) ______________________________________________________________________________________ DAMPER BLADES (SIDE VIEW) DAMPER BLADES

1 2 3

PLAN VIEW OF DAMPER FOR EACH DAMPER SETTING, THE MEASURED APPARENT BLADE WIDTHS WERE AS FOLLOWS :- Apparent width of each damper blade, as measured from plan

view (mm) Damper Setting 1 2 3

Fully Open 38 27 33 Close 1 90 80 80 Close 2 115 115 110 Close 3 134 130 125 Close 4 145 145 142

Volume Control Damper Blade Settings

width blade

2 3 4 5 6 7 9 10 12

2

468

10

20

304070

100

1000

200

Velocity m/sec.

PA

Fully Close

Fully Open

25% Close

75% Close 50% Close

NF - VOLUME CONTROL DAMPER

PRESSURE DROP vs FLOW

The following data are obtained under damper tested on 610mm x 610mm at variousblade positioned.