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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.

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Fan Size Calculator

SINCE 1948.


The HeatBuster is one of the most rugged and dependably built, full service…

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Fan Size Calculator

Eliminate the guesswork. Use these tools to calculate the right size fan everytime.

Calculate the cubic feet of your structure. X X
How many minutes per single air change do you require? Cooling people?

We suggest 2 to 4 minute single air change.

Cooling product?

We suggest 4 to 6 minute single air change.

Removing stagnant air?

We suggest 6 to 10 minute single air change.

Your climate or equipment may alter your minutes required
Please select a number from 2 to 10.
Air Flow Required:{{computedAirFlow ? computedAirFlow.toLocaleString() + " CFM" : null}}

How do I know what size fan to buy?

Precision airflow is a formula.

Building structure:

100’ L X 100’ W X 10’ H = 100,000 CUBIC FEET

Minutes per single air change:


Suggested fan size:VI 5417 (Qty 1)VI 3615 (Qty 2)