SECTION TWO – Heater Installation
Table 2-F: Vent Termination Height
vs. Roof Pitch - U.S.
FIGURE 2-7: Typical Metal Vent Pipe Installation
(Vertical – Negative Pressure) - U.S. Standards
If corrosion is a problem in your area, consider
installing a condensate drain with a trap.
FIGURE 2-8: Typical Metal Vent Pipe Installation
(Vertical – Negative Pressure) - Canadian Standards
2-9
Heater Venting – Negative Pressure
Minimum Height
Roof Pitch Above Roof*
Flat to 6/12 1 Ft.
6/12 to 7/12 1 Ft. 3 in.
>7/12 to 8/12 1 Ft. 6 in.
>8/12 to 9/12 2 Ft.
>9/12 to 10/12 2 Ft. 6 in.
>10/12 to 11/12 3 Ft. 4 in.
>11/12 to 12/12 4 Ft.
>12/12 to 14/12 5 Ft.
>14/12 to 16/12 6 Ft.
>16/12 to 18/12 7 Ft.
>18/12 to 20/12 7 Ft. 6 in.
>20/12 to 21/12 8 Ft.
* Vent must be at least eight (8) feet away from nearest verti-
cal surface. Vents extending five (5) feet or more above the
roof must be braced or guyed. Consult your local code officials
for detailed information.
For Min. Hght.
Min. 8 Ft.
pipe.
Min. 10 Ft. (3.3 M)
pipe. Dispose
local codes.
Min. 2 Ft.
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