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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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FHIR True Reversible Exhaust and Supply Fan

SINCE 1948.

FHIR True Reversible Exhaust and Supply Fan

Triangle’s “FHIR” series industrial-grade true reversible exhaust and supply wall fans come in belt or direct drive models and are ideal for applications that have supply or exhaust needs out of the same fan. Triangle “FHIR” industrial-grade reversible wall fans come with a true, bi-directional venturi and bi-directional airfoil blades. The combination of the bi-directional venturi and blades prevents the traditional loss of performance associated with other “reversible” fans. The FHIR true reversible fan is the highest performing reversible supply and exhaust fan available on the market.


  • Reversible totally enclosed motor
  • Welded construction
  • Comes standard with galvanized wall housing
  • Comes standard with reversing switch
  • Polyester powder coated venturi panel

See full specifications for sizing and performance data

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