22" x 2.5" Low Profile with ¼" Mesh
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Mark vent locations Center nails between rafters away from the roof's peak. Drive nails up through the sheathing and shingles to mark vent locations.
Cut the shingles Cut shingles with a utility knife. Make the cutout area 1/2 inch larger than the vent opening. Chalk provides an easy-to-see cutting line.
Cut the hole Cut a hole in the roof sheathing with a jigsaw or reciprocating saw. Drill a starter hole so you can insert the blade to begin the cut.
Remove any obstructions Slip a pry bar between the shingles and separate the self-sealing adhesive. Then remove any shingle nails that prevent the vent from sliding into place.
Place the vent Slide the vent into place.
Install the vent Nail the lower edge with roofing nails. Add a dab of cement to secure the shingles to the vent base. Apply roof cement (or appropriate caulking) where shingles meet the vent (as shown on pages 3 and 4). Usage of sub-bases is optional.