The pilot hole you drilled should be in the center of the circle.
How to install a roof fan vent.
Afterward install the 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.
Then cover the bottom of the adaptor with 3m marine sealant and clamp it to the roof until dry.
Afterward install the roof vent fan flange as you normally would.
To install a roof adaptor cut and clean the hole in the roof as you would normally.
Use a tape measure to determine the diameter of your fan or check the manufacturer s specifications.
Slide the vent under the shingles so they cover the top half of the vent flange.
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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.
Mount the vent as close to the center of the house as possible.
Then cover the bottom of the adaptor with 3m marine sealant and clamp it to the roof until dry.
The lower half of the flange sits on top of the shingles.
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.
Apply a bead of asphalt roof cement on the bottom of the vent.
Nail the lower corners with roofing nails and tar the heads.
Then get on the roof and draw the circle around the pilot hole with a piece of chalk.
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Mount it as near to the roof ridge without it being visible from the front of the house.