U.S. Installations
1
Canadian Installations
2
A
Clearance above grade, veranda, porch,
deck, or balcony
1 ft (30 cm) 1 ft (30 cm)
B
Clearance to window or door that may be
opened
4 ft (1.2m) below or to side
of opening; 1 foot (30 cm)
above opening
3 ft (91 cm)
C Clearance to permanently closed window * *
D
Vertical clearance to ventilated soffit located
above the terminal within a horizontal dis-
tance of 2 ft (61cm) from the centerline of the
terminal
5 ft (1.5m) *
E Clearance to unventilated soffit * *
F Clearance to outside corner * *
G Clearance to inside corner 6 ft (1.83m) *
H
Clearance to each side of center line ex-
tended above meter/regulator assembly
*
I Clearance to service regulator vent outlet * 6 ft (1.83m)
J
Clearance to non-mechanical air supply inlet
to building or the combustion air inlet to any
other appliance
4 ft (1.2m) below or to side
of opening; 1 ft (30 cm)
above opening
3 ft (91 cm)
K Clearance to mechanical air supply inlet
3 ft (91 cm) above if within
10 ft (3m) horizontally
6 ft (1.83m)
L
Clearance above paved sidewalk or paved
driveway located on public property
7 ft (2.13m)
7 ft (2.13m) t
M
Clearance under veranda, porch, deck or
balcony
* 12 in. (30 cm) TT
1
In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Code
2
In accordance with the current CAN/CSA-B149 Installation Codes
t Vent terminal shall not terminate directly above sidewalk or paved driveway located between 2 single family dwellings that se rves
both dwellings
TT Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor and top of term inal and
underside of veranda, porch, deck or balcony is greater than 1 ft (30cm)
* Clearances in accordance with local installation codes and the requirements of the gas supplier
3 ft (91 cm) within a
height 15 ft above the
meter/regulator assembly
Fig. 7: Minimum Clearances from Vent/Air Inlet Terminations – Indoor and Outdoor Installations
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