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