MODEL 636 / 636AL ROOF CAP
INSTALLATION INSTRUCTIONS
For 3” or 4” Round Duct
Plan installation carefully. Before installing roof cap,
make sure that birdscreen is in place. Refer to “MAIN-
TENANCE” section. Roof cap will accept 3” or 4” round
duct. Tape all joints with duct tape to prevent air and
water leaks. NOTE: DO NOT INSTALL THE ROOF
CAP ON A FLAT ROOF.
1. Cut hole in roof approximately ½” larger than duct-
work.
2. Insert ductwork through opening and run it back to
fan. Leave a maximum of ¾” of duct projecting above
roof surface on the high side.
3. Trim ductwork parallel to roof pitch.
¾"
MAX.
¾"
MAX.
4. Lay roof cap over ductwork and trace outline of roof
flange onto shingles.
2"
1¾"
1¾"
5. Trim shingles as shown, so they will fit snugly around
hood of roof cap when installed. Seal all around duct
with roof cement.
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