Attic Fan FAQ

Take the square foot of your attic and multiply by 0.7. That will give you the minimum CFM rating required for your attic. Add 15 percent for dark covered roofs.

Divide the CFM required by 300 and then multiply the result by 144 to give you the square inches of free air area required.

If you have eve vents or gable vents multiply the length by width of each one. This will give you the square inches, (if the opening is covered with screen divide by 2) The net free area may be stamped in the frame on the vent. Add up all the totals from all of the vents to get your total existing free air area.

We recommend adding additional free air area to insure that your Attic Fan is working at optimal efficiency.

This usually is set around 110 degrees, depending on your climate. If it seems to run too much, raise the setting by 10 degrees.

The dome may be painted using a normal water base exterior house paint. Do attic exhaust fans

Yes, all attic exhaust fans are equipped with a thermostat.

The model 72 variable speed control can be used with the 350, 353, 355, & 350. The model #356 can not be used with a variable speed control.

No. The gable fans are designed to be installed on vertical locations.

Yes, the bird screens are manufactured on the individual roof exhaust fans.

No. The roof exhaust fans are to be installed on horizontal surfaces. The NuTone gable fans are designed for vertical installations.

Yes. Note that a curb will need to be built so that the housing is higher and snow and water levels would not affect product performance.

Yes the DH100W will work.