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    Centrifugal Downblast Exhaust Fan, Product # GB-240-20134X3QD-DR2, 3707-8355 CFM

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    Centrifugal Downblast Exhaust Fan, Product # GB-240-20134X3QD-DR2, 3707-8355 CFM

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    Electrical
    208-230/460V / 3Ph,
    60Hz

    CFM Range
    3707-8355
    CFM

    Motor
    2 HP
    Belt Drive

    • 34 x 34 inch base with prepunched mounting holes for easy attachment to roof curb
    • Variable pitch adjustable motor pulley to optimize fan performance
    • 30.5 x 30.5 inch recommended roof opening

    • Shipping Type:
      Freight
    View other GB-240 products
    $2,836.64
    In stock 
    1 on Hand
    Free shipping
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    Electrical
    208-230/460V / 3Ph,
    60Hz

    CFM Range
    3707-8355
    CFM

    Motor
    2 HP
    Belt Drive

    • 34 x 34 inch base with prepunched mounting holes for easy attachment to roof curb
    • Variable pitch adjustable motor pulley to optimize fan performance
    • 30.5 x 30.5 inch recommended roof opening

    • Shipping Type:
      Freight
    View other GB-240 products

    Model GB, belt drive centrifugal roof exhaust fans are designed to meet the general clean air exhaust requirements for industrial and commercial buildings. Units feature a fully rolled windband bead for increased stability and easy transport. Fresh outside air is drawn in under the motor cover to maximize motor life. Ideal for new installations or for retrofit, replacement applications. Curb adapters and reducers available to eliminate the need to field fabricate transitions when there is an existing roof curb.

    • Centrifugal wheel provides high-efficiency and minimal sound
    • True vibration isolation supports the motor and wheel for long life and quiet operation
    • One-piece aluminum curb cap provides a weather-tight fit
    • Galvanized birdscreen protects the fan discharge from birds and small objects
    • Fully rolled windband bead for increased stability and easy transport
    • Positive motor cooling with fresh air results in maximum motor life
    • Permanent embossed aluminum nameplate for exact model and serial number identification
    • Motor, belt and pulleys shipped loose for field assembly

    Similar to:

    1. ACME PV-180
    2. ACME PV-200
    3. ACME PV-220
    4. ACME PV-220
    5. ACME PV-240
    6. ACME PV-260
    7. Carnes VEBK-21
    8. Loren Cook ACEB-195
    9. Loren Cook ACEB-210
    10. Loren Cook ACEB-225
    11. Loren Cook ACEB-245
    12. Soler & Palau SDB-22
    13. Soler & Palau SDB-22
    14. Twin City Fan BCRD-240D
    15. Twin City Fan BCRD-240DHP

    California Residents-

    Prop 65 Warning
    California Title 20
    Specifications
    Base/Panel Length X Width
    34 x 34 in
    Curb Cap Size
    34 in
    Impeller Diameter
    24 3/4 in
    Roof Opening Width x Roof Opening Length
    30 1/2 x 30 1/2 in
    Base Height
    1 3/4 in
    Base Top to Shroud Top
    31 1/2 in
    Damper Width x Damper Height
    24 x 24 in
    Bearing Size
    1 in
    Height
    31 1/2 in
    Weight
    137 lbs
    Overall Diameter
    42 3/4 in
    Application
    Exhaust General and Clean Air
    Housing Material
    Spun Aluminum
    Drive Type
    Belt Drive
    Impeller Type
    Centrifugal Wheel
    Impeller Material
    Aluminum
    Includes
    Unassembled drive package
    Certifications
    AMCA Sound & Air
    High Wind and Hurricane
    Seismic
    UL/cUL 705
    Drive Package Description
    Motor and drives shipped loose
    Required Accessory
    Roof curb for new installations
    Motor Insulation
    F
    Motor Phase
    3
    Service Factor
    1.15
    Voltage
    208-230/460
    HP
    2
    Hertz
    60
    Motor Enclosure
    Open Drip Proof
    RPM
    1800
    Nominal Efficiency
    86.5
    Shipping Type
    Freight
    Warranty Length
    1 Year
    Performance
    CFM Range
    3707-8355
    FRPM Range
    730-910
    What do these terms (BHP, CFM, Sones, etc.) mean?

    California Title 20 | Fan Energy Index Boundaries
    Fan Energy Index >= 1.00 Efficiency Boundaries

    Max Airflow (CFM) 7101
    Max Fan Speed (RPM) 911
    Max Pressure (in. w.g.) 1.520
    Type of Pressure Static

    Note: Operation outside of these boundaries will result in an energy inefficient operation

    		Ps (in. wg) 0 0.125 0.25 0.375 0.5 0.625 0.75 0.875 1 1.25 1.5
    2 2.06 910 730 CFM 8355 8135 7916 7700 7467 7215 6933 6616 6240 5388 3707
    Sones 24 23 22 21 21 20 19.8 19.8 19.8 17.2 13.8
    Bhp 1.86 1.92 1.97 2.02 2.03 2.05 2.06 2.06 2.05 1.96 1.66
    		2
    		2.06
    		910
    		730
    Ps (in. wg) CFM Sones Bhp
    0 8355 24 1.86
    0.125 8135 23 1.92
    0.25 7916 22 1.97
    0.375 7700 21 2.02
    0.5 7467 21 2.03
    0.625 7215 20 2.05
    0.75 6933 19.8 2.06
    0.875 6616 19.8 2.06
    1 6240 19.8 2.05
    1.25 5388 17.2 1.96
    1.5 3707 13.8 1.66
    • Greenheck Fan Corporation certifies that the model shown herein is licensed to bear the AMCA Seal. The ratings shown are based on tests and procedures performed in accordance with AMCA Publication 211 and AMCA Publication 311 and comply with the requirements of the AMCA Certified Ratings Program.
    • Performance certified is for installation type A: Free inlet, Free outlet.
    • Power rating (BHP/kW) includes transmission losses.
    • Performance ratings include the effects of birdscreen.
    • The sound ratings shown are loudness values in fan sones at 5 ft. (1.5 m) in a hemispherical free field calculated per AMCA Standard 301. Values shown are for installation type A: free inlet hemispherical sone levels.
    Documents

    General

    Instruction Manuals

    Videos

    Common methods for tensioning a rooftop exhaust fan belt

    Centering a wheel on a spun aluminum rooftop exhaust fan

    Questions & Answers
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