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Horizontal Termination Clearance
V
Vent Terminal
Figure 12. Vent Terminal Clearances - ANSI Z21.88-2019, CSA 2.33-2019, and NFPA 54 / ANSI Z223.1 National Fuel Gas Code.
Clearance above grade, veranda, porch, deck,
A
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 (60 cm) from the center line 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 extended
H
above a gas meter or regulator
I
Clearance to service regulator vent outlet
Clearance to nonmechanical air supply inlet
J
to building or the combustion air inlet to any
other appliance
K
Clearance to a mechanical air supply inlet
Clearance above paved sidewalk or paved
L
driveway located on public property
Clearance under veranda, porch, deck, or
M
balcony
Clearance to propane tank relief valve and
N
filler connection
1) In accordance with the current CSA B149.1, Natural Gas and Propane
Installation Code.
2) In accordance with ANSI Z223.1/NFPA 54, National Fuel Gas Code
*
For clearances not specified in ANSI Z223.1/NFPA or CSA B149.1, the
clearance will be in accordance with local installation codes and the
requirements of the gas supplier and these installation instructions.
X
Air Supply
Terminals Prohibited in this Area
Canadian Installations
12 in. (30 cm)
12 in. (30 cm)
12 in. (30 cm)
18 in, (46 cm)
12 in,. (46 cm)
12 in,. (46 cm)
12 in,. (46 cm)
3 ft. (91 cm) within a height 15 ft. above the
meter/regulator assembly
3 ft. (91 cm)
12 in. (30 cm)
6 ft. (1.83 m)
7 ft. (2.13 m) 2
12 in. (30 cm)
4
5 ft. (1.52 m)
N
1
9 in. (23 cm) We recommend 12 in. to prevent
condensation on a window.
9 in. (23 cm) We recommend 12 in. to prevent
condensation on a window.
9 in. (23 cm) We strongly recommend 12 in.
particularly where strong winds prevail.
9 in. (23 cm) We strongly recommend 12 in.
particularly where strong winds prevail.
3 ft. (91) cm above if within 10 ft. (3 m) hori-
zontally
3
5
/ 10 ft. (3.05 m)
3) Permitted only if veranda, porch, deck, or balcony is fully open on a
minimum of two sides beneath the floor.
4) Minimum clearance to tanks not filled on site.
5) Minimum clearance to tanks filled on site from bulk truck.
139647_29 GF 370 DV II IPI 10/23
2 1/2”
12 ”
64 mm
305
3”
mm
76 mm
Figure 13.
Termination Clearance to
overhangs.
2
U.S. Installations
12 in. (30 cm)
18 in, (46 cm)
12 in,. (46 cm)
*
*
9 in. (23 cm)
*
7 ft. (2.13 m)
3
12 in. (30 cm)
4
5
5 ft. (1.52 m)
/ 10 ft. (3.05 m)
11
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