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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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CSS Series No-Cut Joist Ceiling Shutter

SINCE 1948.

CSS Series No-Cut Joist Ceiling Shutter

Owner's Manual
Sales Sheet
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24” CSS24
30” CSS30
36” CSS36
42” CSS42

CSS No-Cut Joist Ceiling Shutter comes standard with Comfort Aide direct drive whole house fans


  • Heavy duty extruded aluminum frames and louvers
  • Polyethylene bearing for smooth, silent operation
  • Shutters open and close automatically keeping out air, insects and dust
  • White enamel finish

See full specifications for sizing and performance data

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