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Step 3 – Marking the Ventilation Hole
From inside the attic, measure approximately 18-24 inches down from the
roof peak and center this spot between two rafters (Fig. 3-1). Through this
mark, drill a screw into the plywood and roof shingle to have it located from
on top of the roof.
Cut a template cardboard at same size as the air duct’s, then puncture it from
center hole over top of the screw, and trace a circle around outer edge of the
template with any marker for a circle at 12’’ or 14” diameter. (Fig. 3-2)
* Alternatively, you can make use of a 6’’or 7’’ cotton thread and strap a pen
at the edge of it. Then move the pen to draw a circle same at 12’’ or 14’’
diameter.
Fig. 3 -1 Fig. 3-2
Step 4 – Cutting the Hole
Bore a pilot hole with your power drill anywhere along inside of the
marked circle. Then insert the saw blade into that pilot hole, and cut a
complete hole into the roof following the circle pattern. (Fig. 4)
NOTE:
• Do not cut through any roofing rafters or framing materials. Only cut
and remove the roof sheeting and shingles.
• Prior to cutting the hole, make sure there is no any wires or waterlines
in the area that you are cutting.
• Try to secure the removed materials before completely cutting out
the circle, so that they do not fall into the attic space.
6 | P a g e
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