Easy2 Technologies - Installing an Attic Fan Product Demo

Installing an Attic Fan Instructions

  • Installing an Attic Fan

    As your attic heats up in the summer, the heat will also heat the interior of your house from the ceiling down. One way to solve this problem is to cool your attic with an attic fan which pulls in fresh air through the roof vents and forces hot attic air out. This exchange of air can make quite a difference in keeping your attic and your house cool in the summer even if your attic is insulated or you have air conditioning. First, decide how you will mount the fan, and the size of fan that you need… and then choose the appropriate model. Before working make sure to turn off the electrical circuit you will be working on.

  • Overview

    The basic steps to installing the fan are to one determine the appropriate type of fan and installation location, two cut any necessary holes into the roof, three install the fan, and four install the thermostat regulator box that controls the fan.

  • Saw Hole for Fan

    To mount an attic fan through the roof, drill a starter hole out through the roof. Then, cut a circle matching the diameter of the fan. Note that if you have a tile, metal, or flat roof, a professional roofer should perform this step.

  • Slip Housing Under Shingles

    Spread a generous amount of roofing mastic around the hole in your roof and slip the flange on the fan housing under the shingles above the hole.

  • Secure Housing

    You might need to replace some shingles surrounding the housing to keep the area water tight. Once in place, nail down all four corners of the flange and put some tar over each of the nails so that you maintain water tightness.

  • Installing Through Gable

    You can also mount the fan through the gable end of older homes. Gable ends should have existing vents set between studs that are 16" apart on center. To make the fan work more efficiently, install blocking between the studs, both above and below the fan to direct the flow of air out and block any vents that are external to the fan.

  • Installing the Regulator

    With the fan in place, remove the regulator cover and secure the regulator to a nearby stud or rafter.

  • Thread Cables

    Remove a knockout for the power supply cable. Install a cable clamp in the hole, thread the cable through the clamp and tighten the clamp. Remove the sheathing on the cable and strip the wires. Repeat the procedure for the fan cable as necessary.

  • Attatch Wires

    Attach the fan wires to the regulator wires as specified by the manufacturer. Usually, all the white wires will go together, the black wires from the supply line and regulator will go together, the black wire from the fan will go to the red wire from the regulator, and the copper or green ground wires will be connected to each other or a ground screw. Refer to the instructions that came with your fan to be certain.

  • Set the Temperature

    When the connections have been made, reinstall the cover to the regulator and set the temperature control to about 95 degrees Fahrenheit… which should provide a good compromise between energy efficiency and cooling. Once you turn your power back on, your fan is ready to start keeping your attic cool. Remember that if it does not come on right away, the temperature might not be warm enough to start the fan. Try turning the regulator down or waiting until the attic gets warmer before concluding that the fan is not working.


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