F. Installing Roof Flashing and Vertical Ter-
mination Cap
To install roof fl ashing see Figure 8.18.
For installation of vertical termination cap see minimum
vent heights for various pitched roofs (see Figure 8.18) .
HORIZONTAL
OVERHANG
2 FT.
20 INCHES MIN.
VERTICAL
MIN.
WALL
LOWEST
DISCHARGE
OPENING
GAS DIRECT VENT
TERMINATION 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*
Over 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
* 3 foot minimum in snow regions
Figure 8.16 Minimum Height from Roof to Lowest Discharge
Opening
WARNING
Fire Risk.
Explosion Risk.
Inspect external vent cap regularly.
• Ensure no debris blocks cap.
• Combustible materials blocking cap may
ignite.
• Restricted air fl ow affects burner operation.