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  • 8/3/2019 Duct Size CAS

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    Duct Diameter Sizing Charts

    The following is needed to determine the duct diameter: CFM and Velocity (CFM / V = AREA).Charts listed below show what duct diameter to use given a CFM and Velocity. Title informationfor each block identifies the name of the fan(s), the curb size and the duct transition partnumber(s) needed to transition from the listed duct to the curb. Duct is sized to the fan inlet andcurb, under-sizing or over-sizing duct will cause system effect and or interfere with the curb.Transition plates are oversized to allow for slight misalignments in duct, transition plates are cut

    to size in the field. Note: the yellow highlighted area in each chart identifies the specific ductdiameter(s) to be used per the charts titled fan.

    DU12HFA - Curb 17 1/2" - Transition Plates DW1710TP & DW1712TP

    Velocity

    CFM 1200 1300 1400 1500 1600 1700 1800

    500 10 10 10 8 8 8 8

    600 10 10 10 10 10 10 8

    700 12 10 10 10 10 10 10

    800 12 12 12 10 10 10 10

    900 12 12 12 12 12 10 10

    1000 14 12 12 12 12 12 12

    1100 14 14 14 12 12 12 12

    1200 14 14 14 14 12 12 12

    1300 16 14 14 14 14 12 12

    1400 16 16 14 14 14 14 12

    NCA08FA NCA10FA - DU25HFA, DU30HFA, DU33HFA, DU50HFA - Curb 19 1/2" -Transition Plates DW1912TP & DW1914TP

    Velocity

    CFM 1200 1300 1400 1500 1600 1700 1800

    700 12 10 10 10 10 10 10

    800 12 12 12 10 10 10 10

    900 12 12 12 12 12 10 10

    1000 14 12 12 12 12 12 12

    1100 14 14 14 12 12 12 12

    1200 14 14 14 14 12 12 12

    1300 16 14 14 14 14 12 12

    1400 16 16 14 14 14 14 12

    1500 16 16 16 14 14 14 14

    1600 16 16 16 14 14 14 14

    1700 18 16 16 16 14 14 14

    1800 18 16 16 16 16 14 14

    1900 18 18 16 16 16 16 14

  • 8/3/2019 Duct Size CAS

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    Duct Diameter Sizing Chart

    NCA14FA - NCA14HPFA - DU75HFA - DU85HFA - Curb 23" - Transition Plates DW2314TP,DW2316TP & DW2318TP

    Velocity

    CFM 1200 1300 1400 1500 1600 1700 1800

    1000 14 12 12 12 12 12 12

    1100 14 14 14 12 12 12 12

    1200 14 14 14 14 12 12 12

    1300 16 14 14 14 14 12 12

    1400 16 16 14 14 14 14 12

    1500 16 16 16 14 14 14 14

    1600 16 16 16 14 14 14 14

    1700 18 16 16 16 14 14 14

    1800 18 16 16 16 16 14 14

    1900 18 18 16 16 16 16 142000 18 18 18 16 16 16 16

    2100 18 18 18 18 16 16 16

    2200 20 18 18 18 16 16 16

    2300 20 20 18 18 18 16 16

    2400 20 20 18 18 18 18 16

    2500 20 20 20 18 18 18 16

    2600 20 20 20 18 18 18 18

    2700 24 20 20 20 18 18 18

    2800 24 20 20 20 18 18 18

    2900 24 24 20 20 20 18 18

    3000 24 24 20 20 20 18 18

    3100 24 24 24 20 20 20 18

  • 8/3/2019 Duct Size CAS

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    Duct Diameter Sizing Chart

    NCA16FA - NCA16HPFA NCA18FA NCA18HPFA - Curb 26 1/2" - Transition PlatesDW2616TP, DW2618TP & DW2620TP

    VelocityCFM 1200 1300 1400 1500 1600 1700 1800

    1300 16 14 14 14 14 12 12

    1400 16 16 14 14 14 14 12

    1500 16 16 16 14 14 14 14

    1600 16 16 16 14 14 14 14

    1700 18 16 16 16 14 14 14

    1800 18 16 16 16 16 14 14

    1900 18 18 16 16 16 16 14

    2000 18 18 18 16 16 16 16

    2100 18 18 18 18 16 16 16

    2200 20 18 18 18 16 16 16

    2300 20 20 18 18 18 16 16

    2400 20 20 18 18 18 18 16

    2500 20 20 20 18 18 18 16

    2600 20 20 20 18 18 18 18

    2700 24 20 20 20 18 18 18

    2800 24 20 20 20 18 18 18

    2900 24 24 20 20 20 18 18

    3000 24 24 20 20 20 18 18

    3100 24 24 24 20 20 20 18

    3200 24 24 24 20 20 20 20

    3300 24 24 24 24 20 20 20

    3400 24 24 24 24 20 20 203500 24 24 24 24 24 20 20

    3600 24 24 24 24 24 20 20

    3700 24 24 24 24 24 20 20

    3800 N/A 24 24 24 24 24 20

    3900 N/A 24 24 24 24 24 20

  • 8/3/2019 Duct Size CAS

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    Duct Diameter Sizing Chart

    NCA24FA - NCA24HPFA - Curb 31 1/2" - Transition Plate DW3124TP

    Velocity

    CFM 1200 1300 1400 1500 1600 1700 1800

    2700 24 20 20 20 18 18 18

    2800 24 20 20 20 18 18 18

    2900 24 24 20 20 20 18 18

    3000 24 24 20 20 20 18 18

    3100 24 24 24 20 20 20 18

    3200 24 24 24 20 20 20 20

    3300 24 24 24 24 20 20 20

    3400 24 24 24 24 20 20 20

    3500 24 24 24 24 24 20 20

    3600 24 24 24 24 24 20 203700 24 24 24 24 24 20 20

    3800 N/A 24 24 24 24 24 20

    3900 N/A 24 24 24 24 24 20

    4000 N/A 24 24 24 24 24 24

    4100 N/A N/A 24 24 24 24 24

    4200 N/A N/A 24 24 24 24 24

    4300 N/A N/A 24 24 24 24 24

    4400 N/A N/A N/A 24 24 24 24

    4500 N/A N/A N/A 24 24 24 24

    4600 N/A N/A N/A 24 24 24 24

    4700 N/A N/A N/A 24 24 24 24

    4800 N/A N/A N/A N/A 24 24 24

    4900 N/A N/A N/A N/A 24 24 24

    5000 N/A N/A N/A N/A 24 24 24

    5100 N/A N/A N/A N/A N/A 24 24

    5200 N/A N/A N/A N/A N/A 24 24

    5300 N/A N/A N/A N/A N/A 24 24

    5400 N/A N/A N/A N/A N/A N/A 24

    5500 N/A N/A N/A N/A N/A N/A 24

    5600 N/A N/A N/A N/A N/A N/A 24

  • 8/3/2019 Duct Size CAS

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    Duct Diameter Sizing Chart

    NCA30FA - NCA30HPFA - Curb 38 1/2" - Transition Plate DW3824TP

    Velocity

    CFM 1200 1300 1400 1500 1600 1700 1800

    2700 24 20 20 20 18 18 18

    2800 24 20 20 20 18 18 18

    2900 24 24 20 20 20 18 18

    3000 24 24 20 20 20 18 18

    3100 24 24 24 20 20 20 18

    3200 24 24 24 20 20 20 20

    3300 24 24 24 24 20 20 20

    3400 24 24 24 24 20 20 20

    3500 24 24 24 24 24 20 20

    3600 24 24 24 24 24 20 203700 24 24 24 24 24 20 20

    3800 N/A 24 24 24 24 24 20

    3900 N/A 24 24 24 24 24 20

    4000 N/A 24 24 24 24 24 24

    4100 N/A N/A 24 24 24 24 24

    4200 N/A N/A 24 24 24 24 24

    4300 N/A N/A 24 24 24 24 24

    4400 N/A N/A N/A 24 24 24 24

    4500 N/A N/A N/A 24 24 24 24

    4600 N/A N/A N/A 24 24 24 24

    4700 N/A N/A N/A 24 24 24 24

    4800 N/A N/A N/A N/A 24 24 24

    4900 N/A N/A N/A N/A 24 24 24

    5000 N/A N/A N/A N/A 24 24 24

    5100 N/A N/A N/A N/A N/A 24 24

    5200 N/A N/A N/A N/A N/A 24 24

    5300 N/A N/A N/A N/A N/A 24 24

    5400 N/A N/A N/A N/A N/A N/A 24

    5500 N/A N/A N/A N/A N/A N/A 24

    5600 N/A N/A N/A N/A N/A N/A 24

  • 8/3/2019 Duct Size CAS

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    Duct Diameter Sizing Charts

    HRE13 - Curb 20 1/2" - Transition Plate DW1914TP & DW1916TP

    Velocity

    CFM 1200 1300 1400 1500 1600 1700 18001000 14 12 12 12 12 12 12

    1100 14 14 14 12 12 12 12

    1200 14 14 14 14 12 12 12

    1300 16 14 14 14 14 12 12

    1400 16 16 14 14 14 14 12

    1500 16 16 16 14 14 14 14

    1600 16 16 16 14 14 14 14

    1700 18 16 16 16 14 14 14

    1800 18 16 16 16 16 14 14

    1900 18 18 16 16 16 16 14

    2000 18 18 18 16 16 16 16

    2100 18 18 18 18 16 16 16

    2200 20 18 18 18 16 16 16

    2300 20 20 18 18 18 16 16

    2400 20 20 18 18 18 18 16

    2500 20 20 20 18 18 18 16

    HRE16 - Curb 24 1/2" - Transition Plate DW2318TP & DW2620TP

    Velocity

    CFM 1200 1300 1400 1500 1600 1700 1800

    1700 18 16 16 16 14 14 141800 18 16 16 16 16 14 14

    1900 18 18 16 16 16 16 14

    2000 18 18 18 16 16 16 16

    2100 18 18 18 18 16 16 16

    2200 20 18 18 18 16 16 16

    2300 20 20 18 18 18 16 16

    2400 20 20 18 18 18 18 16

    2500 20 20 20 18 18 18 16

    2600 20 20 20 18 18 18 18

    2700 24 20 20 20 18 18 18

    2800 24 20 20 20 18 18 182900 24 24 20 20 20 18 18

    3000 24 24 20 20 20 18 18

    3100 24 24 24 20 20 20 18

    3200 24 24 24 20 20 20 20

    3300 24 24 24 24 20 20 20

    3400 24 24 24 24 20 20 20

    3500 24 24 24 24 24 20 20

    3600 24 24 24 24 24 20 20

    3700 24 24 24 24 24 20 20

    3800 N/A 24 24 24 24 24 20

  • 8/3/2019 Duct Size CAS

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    3900 N/A 24 24 24 24 24 20

    Duct Diameter Sizing Chart

    HRE20 - Curb 28 1/2" - Transition Plate DW2620TP & DW3124TP

    Velocity

    CFM 1200 1300 1400 1500 1600 1700 1800

    2200 20 18 18 18 16 16 16

    2300 20 20 18 18 18 16 16

    2400 20 20 18 18 18 18 16

    2500 20 20 20 18 18 18 16

    2600 20 20 20 18 18 18 18

    2700 24 20 20 20 18 18 18

    2800 24 20 20 20 18 18 18

    2900 24 24 20 20 20 18 18

    3000 24 24 20 20 20 18 18

    3100 24 24 24 20 20 20 18

    3200 24 24 24 20 20 20 20

    3300 24 24 24 24 20 20 203400 24 24 24 24 20 20 20

    3500 24 24 24 24 24 20 20

    3600 24 24 24 24 24 20 20

    3700 24 24 24 24 24 20 20

    3800 N/A 24 24 24 24 24 20

    3900 N/A 24 24 24 24 24 20

    4000 N/A 24 24 24 24 24 24

    4100 N/A N/A 24 24 24 24 24

    4200 N/A N/A 24 24 24 24 24

    4300 N/A N/A 24 24 24 24 24

    4400 N/A N/A N/A 24 24 24 24

    4500 N/A N/A N/A 24 24 24 24

    4600 N/A N/A N/A 24 24 24 24

    4700 N/A N/A N/A 24 24 24 24

    4800 N/A N/A N/A N/A 24 24 24

    4900 N/A N/A N/A N/A 24 24 24

    5000 N/A N/A N/A N/A 24 24 24

    5100 N/A N/A N/A N/A N/A 24 24

    5200 N/A N/A N/A N/A N/A 24 24

    5300 N/A N/A N/A N/A N/A 24 24

    5400 N/A N/A N/A N/A N/A N/A 24

    5500 N/A N/A N/A N/A N/A N/A 24

    5600 N/A N/A N/A N/A N/A N/A 24

  • 8/3/2019 Duct Size CAS

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    Duct Diameter Sizing Chart

    HRE24 - Curb 32 1/2" - Transition Plate DW3124TP

    Velocity

    CFM 1200 1300 1400 1500 1600 1700 18002700 24 20 20 20 18 18 18

    2800 24 20 20 20 18 18 18

    2900 24 24 20 20 20 18 18

    3000 24 24 20 20 20 18 18

    3100 24 24 24 20 20 20 18

    3200 24 24 24 20 20 20 20

    3300 24 24 24 24 20 20 20

    3400 24 24 24 24 20 20 20

    3500 24 24 24 24 24 20 20

    3600 24 24 24 24 24 20 20

    3700 24 24 24 24 24 20 20

    3800 N/A 24 24 24 24 24 20

    3900 N/A 24 24 24 24 24 20

    4000 N/A 24 24 24 24 24 24

    4100 N/A N/A 24 24 24 24 24

    4200 N/A N/A 24 24 24 24 24

    4300 N/A N/A 24 24 24 24 24

    4400 N/A N/A N/A 24 24 24 24

    4500 N/A N/A N/A 24 24 24 24

    4600 N/A N/A N/A 24 24 24 24

    4700 N/A N/A N/A 24 24 24 24

    4800 N/A N/A N/A N/A 24 24 24

    4900 N/A N/A N/A N/A 24 24 245000 N/A N/A N/A N/A 24 24 24

    5100 N/A N/A N/A N/A N/A 24 24

    5200 N/A N/A N/A N/A N/A 24 24

    5300 N/A N/A N/A N/A N/A 24 24

    5400 N/A N/A N/A N/A N/A N/A 24

    5500 N/A N/A N/A N/A N/A N/A 24

    5600 N/A N/A N/A N/A N/A N/A 24


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