25
Installation
Canadian Installations
1
US Installations
2
A
Clearance above grade, veranda, porch,
deck, or balcony
12" (305 mm)
12" (305 mm)
B
Clearance to window or door that may be
opened
12" (305 mm)
9" (229 mm)
C
Clearance to permanently closed window•
*
*
D
Vertical clearance to ventilated soffit
18" (457.2 mm)
*
E
Clearance to unventilated soffit
12" (305 mm)
12" (305 mm)
F
Clearance to outside corner
0" (0 mm)
0" (0 mm)
G
Clearance to inside corner
9" (228.6 mm)
9" (228.6 mm)
H
Clearance to each side of center line
extended above meter / regulator
3' (914 mm) within a height 15' (4.57 m)
above the meter / regulator assembly
*
I
Gas service regulator vent outlet
3' (914 mm)
*
J
Clearance to non-mechanical air supply inlet
to building or the combustion air inlet to any
other appliance
12" (305 mm)
9" (229 mm)
K
Clearance to mechanical air supply inlet
6' (1.83 m)
3' (914 mm) above if within 10' (3.05 mm)
L
Clearance above paved sidewalk or driveway
located on public property.
7' (2.13 m) †
*
M
Clearance under veranda, porch, deck, or
balcony.
12" (305 mm) ‡
*
N
Minimum clearance from roof to lowest
discharge opening.
18" (457 mm)
18" (457 mm)
O
Clearance from vertical vent to adjacent wall.
24" (610 mm)
24" (610 mm)
Notes:
1) In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2) In accordance with the current ANSI Z223.1/NFPA 54, Natural Fuel Gas Code.
• Recommended to prevent condensation on the window.
* For clearances not specified and ANSI Z223.1/NFPA 54 or CSA B149.1, clearance must be in accordance with local installation codes and the
requirements of the gas supplier.
† 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.
WARNING
A safety cage may be required to cover a horizontal termination if the termination is located near a walkway. See local codes.
