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Clearance Description
Canadian Installations (1)
US Installations (2)
J =
Clearance to non-mechanical air supply inlet to building or the combustion air
inlet to any other appliance
12 in (30 cm)
12 in (30 cm)
K =
Clearance to a mechanical air supply inlet
6 ft (1.83 m)
3 ft (91 cm) above if within
10 ft (3 m) horizontally
L =
Clearance above paved sidewalk or paved driveway located on public property
7 ft (2.13 m) †
7 ft (2.13 m) *
M =
Clearance under veranda, porch, deck, or balcony
12 in (30 cm) ‡
*
* Refer to ANSI Z223.1/NFPA 54 or CSA B149.1, for clearances not specified in these requirements, one of the
following shall be indicated:
i) The minimum distance from adjacent public walkways, adjacent buildings, openable windows, and building
openings shall not be less than those values specified in the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or
the Natural Gas and Propane Installation Code, CSA B149.1;
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family
dwellings and serves both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
Notes:
In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
If locally adopted installation codes specify clearances different than those illustrated, then the most stringent
clearance shall prevail.
1
2
Determine the number of elbows of 90 degrees that will be used in the evacuation system (two elbows of
45 degrees being considered as a single elbow of 90 degrees).
Refer to the table below to determine the maximum length in function of the number of elbows.
For example:
If you have only one elbow, the maximum length will be 10.7 m (35 ft).
Termination Details
Termination Configuration
VERTICAL TERMINATIONS
The air intake requires a return bend or two 90º elbows to prevent entry of rain.
The vent termination and air intake must be in the same pressure zone.
1
2
NUMBER OF ELBOWS OF 90º
0
1
2
3
4
5
6
41 ft (12.5 m)
35 ft (10.7 m)
29 ft (8.8 m)
23 ft (7.0 m)
17 ft (5.2 m)
11 ft (3.4 m)
5 ft (1.5 m)
3