Hearth and Home Technologies RCOR-HVB-IPI Minimum Height from Roof to Lowest Discharge Opening

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 (25.4mm) clear- ance 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 MIN- IMUM HEIGHTS ARE NECESSARY IN THE INTER- EST OF SAFETY. SEE THE FOLLOWING DIAGRAM FOR MINIMUM HEIGHTS, PROVIDED THE TERMI- NATION CAP IS AT LEAST 20 INCHES FROM A VER- TICAL WALL AND 2-FEET BELOW A HORIZONTAL OVERHANG.

NOTE: This also pertains to vertical vent systems in- stalled on the outside of the building.

To seal the roof hole, and to divert rain and snow from the vent system:

•Attach a flashing to the roof using nails, and use a non- hardening mastic around the edges of the flashing base where it meets the roof.

•Attach a storm collar over the flashing joint to form a water-tight seal. Place non-hardening mastic around the joint, between the storm collar and the vertical pipe.

•Slide the termination cap over the end of the vent pipe and snap into place.

		HORIZONTAL
		OVERHANG
2 FT.	20 INCH MIN.	VERTICAL
MIN.
		WALL
	LOWEST
	DISCHARGE
TERMINATION	OPENING
CAP
		X
		12
		ROOF PITCH
		IS X/ 12
	H (MIN.) - MINIMUM HEIGHT FROM ROOF
	TO LOWEST DISCHARGE OPENING

Roof Pitch	H (min.) ft.
flat to 6/12	1.0
6/12 to 7/12	1.25
over 7/12 to 8/12	1.5
over 8/12 to 9/12	2.0
over 9/12 to 10/12	2.5
over 10/12 to 11/12	3.25
over 11/12 to 12/12	4.0
over 12/12 to 14/12	5.0
over 14/12 to 16/12	6.0
over 16/12 to 18/12	7.0
over 18/12 to 20/12	7.5
over 20/12 to 21/12	8.0

Figure 30. Minimum Height from Roof to Lowest Discharge Opening

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