Hearth and Home Technologies CFX-Crescent This also pertains to vertical vent systems installed

For Vertical Terminations - To locate the vent and install the vent sections:

• Locate and mark the vent centerpoint on the underside 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 an- chored 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 appro- priate distance above the roof (for outside termi- nations).

! 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.

Heat & Glo • CFX-CRESCENT • 705-900 Rev. P • 12/07 25