Installing a Roof Fan


If it is not possible to install a gable fan, a roof fan is the next best choice. Wiring is simple. Follow the manufacturer's instructions for cutting the hole and attaching the fan.


About 5 hours to cut a hole in the roof, install the fan, and run cable inside an attic

Voltage tester, drill, bit, reciprocating saw or jigsaw, pry bar, utility and putty knives, screwdriver, strippers, long-nose pliers, lineman's pliers

General carpentry, splicing wires and connecting wires to terminals, installing boxes, running cable in walls and ceilings

Find power source and make sure the fan does not overload the circuit.

Roof fan, cable, roofing nails, roofing cement, wire nuts, cable clamps, electrician's tape

Once the fan is attached to the roof, wire the fan's thermostat directly to a power source. Some roof fans have a humidistat, which measures humidity, in addition to a thermostat. This runs the fan when the attic humidity is high, even if the temperature is not.

Step 1

Drill a locator hole from the inside of the attic to ensure that you do not cut through a joist. Mark the roof with the manufacturer's template and cut the hole with a jigsaw or reciprocating saw.

Step 2

You may need to cut back some shingles. Slide the fan into place so that shingles cover the top half of its flange.

Step 3

Drive roofing nails and cover them with roofing cement. Use roofing cement to seal down the roofing above and beside the vent. Wire the fan as you would a gable fan.

Comments (1)
xiehui14236 wrote:

This artical is very useful! If you need roof mounted fans, please view

6/19/2017 08:51:56 PM Report Abuse
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One Hour or Less

Three simple projects to cross off of your to-do list -- just print these instructions and begin!