But before you cut any holes plan the locations of the attic vents.
Installing roof ventilation fan.
This way you don t have to cut a brand new hole but simply make the hole for the vent larger so it can accommodate the fan.
You install an attic fan through the roof and flashed under the shingles.
To save time use an existing roof or gable vent to install your new attic fan.
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Apply a bead of asphalt roof cement on the bottom of the vent.
To install an attic fan over a gable vent in your attic trace the body of the fan onto a piece of plywood that s wide enough to mount on the studs on each side of the vent.
Gable fans are installed at the very top of your gable end walls and vented through the walls outside.
Photos 1 6 show how it s done.
Mark the roof venting locations from the attic where you can see the rafters and avoid placing roofing vents over them.
The lower half of the flange sits on top of the shingles.
Choosing a whole house fan.
Then cut out the circle with a reciprocating saw and mount the fan over the cutout using a drill.
You also want a fan that s appropriate for the square footage of your attic space by checking the manufacturer s specifications.
Adding attic vents is a simple matter of cutting holes and installing vents.
However if you are mounting 1 the vent or fan on your roof or if you are installing an electric or solar powered fan you will need to hire a professional installer to do the job.
Roofers charge between 45 and 75 per hour.