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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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RIWS Supply Shutters

SINCE 1948.

RIWS Supply Shutters

Owner's Manual
Choose a model below to view drawing
24” RIWS21 RIWS24
30” RIWS24 RIWS30

Triangle’s RIWS Supply 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 RIWS Supply Shutters are equipped to withstand even the most demanding environments.

Note: Triangle’s Supply Shutters must be equipped with an operator. Shutter must be opened before fan is energized.


  • 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