Make a template using cardboard that s the width of your overhang with a hole the size of the vent cut in it.
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Using a sawzall cut any roofing nails in the area of the lower mounting plate flush with the sheathing.
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Apply asphalt roof cement to the bottom of the vent and slide in the vent under the shingles.
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Turn your vent upside down and apply a thick bead of caulk to the flange.
Next use a reciprocating saw with a rough in blade to cut the out the marked template.
The should cover the top of the vent flange.
The lower part of the vent flange however will sit on top of the shingles.
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Use a tall ladder to reach a taller overhang.
Slide the top and sides of your vent underneath the surrounding shingles and leave the bottom side of the vent exposed and laying over the shingles.
Next hammer in a nail every few inches to secure the vent to your roofing structure.
The size of the rectangle will depend on the size of the vents but.
Use roofing nails to nail the lower half of the flange in place at the corners.
To install the vent the roofer slips the flange the metal lip of the vent under shingles at the upper part of the hole and rests the flange on top of the shingles at the down slope part of the hole.