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Additional Resources

Downloads, FAQs, and more.

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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IWS Exhaust Shutters

SINCE 1948.

IWS Exhaust Shutters

Owner's Manual
Choose a model below to view drawing
24” IWS21 IWS24
30” IWS24 IWS30
54” IWSD51 IWSD54
60” IWSD57 IWSD60

Triangle’s IWS Exhaust Shutters are designed for long lasting operation and proper air flow. With a bronze finish, polyester powder coated, welded galvanized steel frame, extruded aluminum blades and bronze pivot bushings, Triangle IWS Exhaust Shutters are equipped to withstand even the most demanding environments.


  • Extruded aluminum blades
  • Welded galvanized steel frame
  • Bronze pivot bushings
  • Bronze finish, polyester powder coated frame
  • Single and double panel models
  • Wall mount and fan mount models