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Additional Resources

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Frequently Asked Questions View all FAQs
How do you order the correct replacement parts?

Before ordering replacement parts, make sure you have the fan model and serial number.

Where can I find instructions to wire a motor on my fan?

The nameplate of the motor includes a wiring diagram. Wiring diagrams can also be found beneath the motor image in our Buy Parts section. Simply click the wiring diagram icon to view it.

Can I install a thermostat?

Yes, but only if the thermostat has a simple on/off operation. Please note: if the thermostat varies the amount of voltage delivered, it will damage the motor and void the warranty.

Can I install my whole house fan vertically?

Comfort Cooler (CC) series whole-house fans may be mounted vertically, however, the AS and CSS shutters will not function properly in the vertical position. We do not carry a ceiling shutter for vertical installation. Vertical installation instructions.

Quality Products

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JBX Jet Upblast

SINCE 1948.

JBX Jet Upblast

JBX Jet Upblast belt drive fans are designed for heavy-duty commercial and industrial applications. Airfoil cast aluminum propellers are spark resistant. All welded construction assures long life and accurate drive alignment for maximum fan performance and minimum vibration.


  • Available in 24” to 84” diameters
  • Polyester powder coat finish
  • Motor, belt drive and pulleys are outside the airstream
  • Fan serviced from roof of building
  • Heavy gauge galvanized sheet steel curb base
  • All welded construction gives long maintenance-free service
  • Cast aluminum airfoil blades mounted on heavy duty cast aluminum fixed pitch hub for quiet, efficient operation
  • Galvanized sheet steel wind band with two formed reinforcing ribs for protection from weather and cross winds
  • Galvanized steel inner throat is riveted to the deep venturi-type orifice for quieter, more efficient operation
  • EXTERNAL BRACING used on larger units to give extra rigidity and prevent sagging and vibration
  • DAMPER LID open/shut automatically when fan is turned on/off
  • Adjustable neoprene tipped positive bumper stops assure closure of damper lids when fan is cut off, yet permit maximum air flow when open.

See full specifications for sizing and performance data

View Full Specs

Hazardous Location Models

Hazardous location models are made to order and are not returnable.

  • No wiring
  • Non-sparking aluminum blades
  • Stationary motor mounts
  • Belt drive: single speed, Div. I, Class I, Group D & Class II, Groups F & G