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    Centrifugal Downblast Exhaust Fan, Product # GB-300-50140X3QD-DR1, 6984-11663 CFM

    Centrifugal Downblast Exhaust Fan, Product # GB-300-50140X3QD-DR1, 6984-11663 CFM

    • 40 x 40 inch base with prepunched mounting holes for easy attachment to roof curb
    • Variable pitch adjustable motor pulley to optimize fan performance
    • 36.5 x 36.5 inch recommended roof opening
    • Shipping Type:
      Freight
    $3,646.04
    25 Days
    Lead Time 
    Free shipping
    OR
    Need a specific configuration?
    Submit a request online and get a quote from your local representative within 4 hours.

    • 40 x 40 inch base with prepunched mounting holes for easy attachment to roof curb
    • Variable pitch adjustable motor pulley to optimize fan performance
    • 36.5 x 36.5 inch recommended roof opening
    • Shipping Type:
      Freight

    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-240
    2. ACME PV-260
    3. ACME PV-300
    4. ACME PV-300
    5. Carnes VEBK-24
    6. Loren Cook ACEB-245
    7. Loren Cook ACEB-270
    8. Loren Cook ACEB-270
    9. Loren Cook ACEB-300
    10. Soler & Palau SDB-24
    11. Soler & Palau SDB-24
    12. Soler & Palau SDB-27
    13. Soler & Palau SDB-27
    14. Twin City Fan BCRD-300D
    15. Twin City Fan BCRD-300DHP

    California Residents-

    Prop 65 Warning
    California Title 20
    Specifications
    Base/Panel Length X Width
    40 x 40 in
    Curb Cap Size
    40 in
    Impeller Diameter
    30 3/4 in
    Roof Opening Width x Roof Opening Length
    36 1/2 x 36 1/2 in
    Base Height
    1 3/4 in
    Base Top to Shroud Top
    36 in
    Damper Width x Damper Height
    34 x 34 in
    Bearing Size
    1 in
    Height
    36 in
    Weight
    199 lbs
    Overall Diameter
    50 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
    5
    Hertz
    60
    Motor Enclosure
    Open Drip Proof
    RPM
    1800
    Nominal Efficiency
    89.5
    NEMA Frame Size
    184T
    Shipping Type
    Freight
    Warranty Length
    1 Year
    Performance
    CFM Range
    6984-11663
    FRPM Range
    630-720

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

    Max Airflow (CFM) 1119
    Max Fan Speed (RPM) 891
    Max Pressure (in. w.g.) 2.180
    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
    5 2.69 720 630 CFM 11663 11342 11022 10643 10259 9868 9439 8970 8447 6984
    Sones 21 21 20 19.7 19.4 19 18.5 17.8 16.9 14.5
    Bhp 2.5 2.55 2.6 2.64 2.67 2.68 2.69 2.68 2.65 2.49
    5
    2.69
    720
    630
    Ps (in. wg) CFM Sones Bhp
    0 11663 21 2.5
    0.125 11342 21 2.55
    0.25 11022 20 2.6
    0.375 10643 19.7 2.64
    0.5 10259 19.4 2.67
    0.625 9868 19 2.68
    0.75 9439 18.5 2.69
    0.875 8970 17.8 2.68
    1 8447 16.9 2.65
    1.25 6984 14.5 2.49
    • 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
    Videos

    Common methods for tensioning a rooftop exhaust fan belt

    Centering a wheel on a spun aluminum rooftop exhaust fan

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