Installing a Roof Attic Fan Installing a Roof Attic Fan

What You'll Need
Pencil
Reciprocating Saw
Roofing Mastic
Roof Attic Fan
Roofing Mastic
Screw
Screwdriver
Cable Clamp
Wire Strippers

A roof attic fan is positioned in the attic to cool the space. A cool attic will consequently cool the rest of your house, as hot air rises, and rather than getting trapped, it escapes through the fan to the outdoors. A roof attic fan is commonly used in properties that are subject to high temperatures for the majority of the year.

Step 1 – Make a Hole in the Roof

Place the attic fan against the roof, and make a pencil outline around it. Cut the space out using a reciprocating saw.

Step 2 – Attach the Fan

Place the roof attic fan through the hole in the roof from the outside, and apply a generous amount of roofing mastic around the hole to keep the fan in place. You will slide the flange under the roof shingles above the hole, and the flange below the hole will be pressed down and sealed in place by the roofing mastic.

Step 3 – Fix the Regulator

First, you need to remove the regulator cover of the roof attic fan. Second, screw the regulator into place on a nearby beam. The regulator has two small holes in the metal, which is where the screw should be placed.

Step 4 – Connect the Power Cables

Install a cable clamp in the top hole of the regulator, and thread the power supply cable through the cable clamp. Tighten the clamp to ensure the cable does not move around. Next, remove the sheathing on the cable, and strip the wires using wire strippers. To connect the fan cable, repeat this step for the fan regulator through the bottom hole of the regulator.

Step 5 – Connect the Wires

The wires from the power cables need to be attached to the wires from the fan and the regulator. The power cable, fan cable and regulator will all have one white wire, and these all need to be connected together. The black wire from the power cable and the black wire from the regulator need to be attached together. Meanwhile, the black wire from the roof attic fan cable should be attached to the red wire attached to the regulator. Finally, the remaining copper and green wires will be connected to the ground screw in order to ground the roof attic fan.

Step 6 – Secure the Cover on the Regulator

Replace the cover on the regulator by screwing it in place with the screwdriver; this is the cover that you removed in Step 3 before connecting the cables. Then, set the temperature to 95°F, which is a good balance between energy efficiency and cooling capabilities.

Step 7 – Check that the Fan works

Turn the roof attic fan on, and it should start to rotate and cool your attic. If it does not start working immediately, then you have two options. The first option is to lower the temperature on the regulator because the room's temperature may be lower than the set temperature. Alternatively, you can wait until the room heats up to 95°F. If neither of these options triggers the fan to start working, then you have installed the fan incorrectly or there is a defect in the roof attic fan. 

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