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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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FHI Supply or Exhaust Fan

SINCE 1948.

FHI Supply or Exhaust Fan

Triangles “FHI” Series Severe Duty supply or exhaust fans come in belt or direct drive models and are ideal for applications with higher performance requirements. Triangles “FHI” series severe-duty fans come standard with cast aluminum airfoil blades and are designed to operate in factories, steel mills, processing facilities, oil and gas rigs, and many other severe duty industrial applications.


  • 16” to 84” blade diameter models available (60” for direct drive)
  • 3,610 CFM to 115,800 CFM
  • Durable gray polyester powder coat finish
  • Deep spun venturi type orifice for quieter, more efficient operation
  • Rugged all welded structural frame for added support and lower vibration
  • Heavy duty self aligning ball bearing pillow blocks, to insure long maintenance free operation
  • Taper lock bushing between propeller and shaft for ease of removal, should it become necessary
  • Heavy duty V belt drive with cast iron sheaves, dynamically balanced fan and motor sheaves and extra strength V belts
  • Split tapered standard drive hubs permit easy removal of the fan from the shaft for maintenance purposes

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
  • Direct drive: consult factory