Use a tape measure to determine the diameter of your fan or check the manufacturer s specifications.
How to install a roof fan vent.
Then cover the bottom of the adaptor with 3m marine sealant and clamp it to the roof until dry.
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Drip edge vents are a two in one installation that promote water shedding at the eaves and rakes of a roof while also allowing for ventilation into the attic.
Apply a bead of asphalt roof cement on the bottom of the vent.
Then cover the bottom of the adaptor with 3m marine sealant and clamp it to the roof until dry.
So there you have it.
To install a roof adaptor cut and clean the hole in the roof as you would normally.
Draw a circle on the roof matching the diameter of your fan.
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Afterward install the roof vent fan flange as you normally would.
A drip edge vent is made of a corrosive resistant material that sticks out about three inches back from the roof edge and then bends downward over them.
Consider two things for maximum performance when you choose the location of the vent.
To install a roof adaptor cut and clean the hole in the roof as you would normally.
Then get on the roof and draw the circle around the pilot hole with a piece of chalk.
Nail the lower corners with roofing nails and tar the heads.
Before you begin make sure all factory installed bolts are tightened.
The pilot hole you drilled should be in the center of the circle.
Mount it as near to the roof ridge without it being visible from the front of the house.
The lower half of the flange sits on top of the shingles.