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.
6" Minimum
Clearance to
Combustible
Materials
Listed
Termination
Cap
Storm Collar
Flashing
Firestop
Vent
Body
Metal Flue
Collar
Class B Double Wall
Metal Vent Pipe
See Table 4
For Min. Hght.
Min. 8 Ft.
Support Vertical
Vent Pipe so
adapter does not
take weight of
pipe.
6" (15 cm) Minimum
Clearance to Combustible
Materials
Listed
Termination
Cap
Storm Collar
Flashing
Firestop
Vent
Body
Metal Flue
Collar
Type B Double Wall
Metal Vent Pipe
2731 1296 CAN
Min. 10 Ft. (3.3 M)
Support Vertical
Vent Pipe so
adapter does not
take weight of
pipe. Dispose
of condensate
according to
local codes.
Type B Double Wall
Metal Vent Tee
Condensate
Drain w/trap
Min. 2 Ft.
(.7 M)
