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    Axial Upblast Exhaust Fan, Product # RBU-2L48-50X-QD

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    Axial Upblast Exhaust Fan, Product # RBU-2L48-50X-QD

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    Electrical


    CFM Range
    20547-37220
    CFM

    Motor

    Belt Drive

    • 48 inch steeply pitched, fabricated steel propeller for low sound levels
    • 58 x 58 inch base with prepunched mounting holes for easy attachment to roof curb
    • 54.5 x 54.5 inch recommended roof opening

    • Shipping Type:
      Freight
    $6,235.56
    In stock 
    38 on Hand
    Free shipping
    Select
    OR
    Need a specific configuration?
    Submit a request online and get a quote from your local representative within 4 hours.
    Request A quote

    Electrical


    CFM Range
    20547-37220
    CFM

    Motor

    Belt Drive

    • 48 inch steeply pitched, fabricated steel propeller for low sound levels
    • 58 x 58 inch base with prepunched mounting holes for easy attachment to roof curb
    • 54.5 x 54.5 inch recommended roof opening

    • Shipping Type:
      Freight

    Model RBU is an upblast axial exhaust fan designed to discharge air and contaminants up and away from the roof deck for commercial and industrial applications like warehouses, manufacturing facilities and distribution centers. Utilizing a welded steel propeller, this belt-driven fan is designed to run at lower RPMs, producing lower sound levels and is recommended for sound sensitive applications. The motor is located inside of the airstream and is cooled as air exhausts over the motor.

    • Variable pitch adjustable motor pulley to optimize fan performance
    • Adjustable motor plate for belt tensioning
    • Drive assembly belts, pulleys and keys are sized for 150% of driven horsepower
    • Belts are static–resistant and oil free
    • Cast iron pillow block bearings with grease fittings
    • Steel butterfly dampers prevent backdrafts and provide weather protection when fan is not in operation
    • Drive frames are die-formed, galvanized structural settl to provide a rigid platform for motors, shafts, bearings and drives
    • Windband mounting brackets are designed to also be used as lifting lugs for ease when lifting unit to the roof deck

    California Residents-

    Prop 65 Warning
    California Title 20
    Specifications
    Shaft Diameter
    1.75 in
    Base/Panel Length X Width
    58 x 58 in
    Curb Cap Size
    58 in
    Impeller Diameter
    48 in
    Roof Opening Width x Roof Opening Length
    54 1/2 x 54 1/2 in
    Base Height
    1 3/4 in
    Bearing Size
    1 1/4 in
    Width
    58 in
    Height
    40 in
    Weight
    580 lbs
    Application
    Exhaust General and Clean Air
    Exhaust Air
    Housing Material
    Galvanized Steel
    Drive Type
    Belt Drive
    Impeller Type
    Propeller
    Impeller Material
    Steel
    Includes
    Steel butterfly damper
    Certifications
    AMCA Sound & Air
    UL/cUL 705
    Drive Package Description
    Drives Assembled
    Required Accessory
    Roof curb for new installations
    Shipping Type
    Freight
    Warranty Length
    1 Year
    Performance
    CFM Range
    20547-37220
    FRPM Range
    494-582
    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) 3505
    Max Fan Speed (RPM) 595
    Max Pressure (in. w.g.) 0.670
    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
    5 5 559 - CFM - - - - - -
    Sones - - - - - -
    Bhp - - - - - -
    5 5.62 582 494 CFM 37220 35349 32956 29829 27259 20547
    Sones 30 30 30 30 30 30
    Bhp 5.41 5.49 5.6 5.62 5.56 5.28
    		5 5
    		5 5.62
    		559 582
    		- 494
    Ps (in. wg) CFM Sones Bhp CFM Sones Bhp
    0 - - - 37220 30 5.41
    0.125 - - - 35349 30 5.49
    0.25 - - - 32956 30 5.6
    0.375 - - - 29829 30 5.62
    0.5 - - - 27259 30 5.56
    0.625 - - - 20547 30 5.28
    Documents

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