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If you do not have a hole saw tear this page o and cut the
circle out. Then place on the ductwork in desired position
and trace the rectangle. Drill holes as indicated and then
use a jig saw or metal cutting snips to cut out the circle.
Step 3
Insert unit into
pre-cut hole.
Step 4
Drill the metal
tapping screws in to
hold unit in place.
Cut Out