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For Vertical Terminations - To locate the vent and
install the vent sections:
Locate and mark the vent centerpoint on the under-
side of the roof, and drive a nail through the
centerpoint.
Make the outline of the roof hole around the
centerpoint nail.
The size of the roof hole framing dimensions
depend on the pitch of the roof. There MUST BE a
1-inch (25.4 mm) clearance from the vertical vent
pipe to combustible materials.
Mark the roof hole accordingly.
Cover the opening of the installed vent pipes.
Cut and frame the roof hole.
Use framing lumber the same size as the roof
rafters and install the frame securely. Flashing
anchored to the frame must withstand heavy winds.
Continue to install concentric vent sections up
through the roof hole (for inside vent installations) or
up past the roof line until you reach the appropriate
distance above the roof (for outside terminations).
WARNING
MAJOR U.S. BUILDING CODES
SPECIFY MINIMUM CHIMNEY AND/OR
VENT HEIGHT ABOVE THE ROOF TOP.
THESE MINIMUM HEIGHTS ARE
NECESSARY IN THE INTEREST OF
SAFETY. SEE THE FOLLOWING
DIAGRAM FOR MINIMUM HEIGHTS,
PROVIDED THE TERMINATION CAP IS
AT LEAST TWO (2) FEET FROM A
VERTICAL WALL AND 2-FEET BELOW A
HORIZONTAL OVERHANG.
NOTE
This also pertains to vertical vent systems installed
on the outside of the building.