11
139467_03 GF 370 DV II June 2015
Figure 12. Vent Terminal Clearances - ANSI Z21.88-2014, CSA 2.33-2014, and National Fuel Gas Code.
Horizontal Termination Clearance
Figure 13.
Termination Clearance
to overhangs.
Canadian Installations
1
U.S. Installations
2
A
Clearance above grade, veranda, porch, deck,
or balcony
12 in. (30 cm)
12 in. (30 cm)
B
Clearance to window or door that may be
opened
12 in. (30 cm)
9 in. (23 cm) We recommend 12 in. to prevent
condensation on a window.
C
Clearance to permanently closed window
12 in. (30 cm)
9 in. (23 cm) We recommend 12 in. to prevent
condensation on a window.
D
Vertical clearance to ventilated soffit located
above the terminal within a horizontal
distance of 2 ft (60 cm) from the center line
of the terminal
18 in, (46 cm)
18 in, (46 cm)
E
Clearance to unventilated soffit
12 in,. (46 cm)
12 in,. (46 cm)
F
Clearance to outside corner
12 in,. (46 cm)
9 in. (23 cm) We strongly recommend 12 in.
particularly where strong winds prevail.
G
Clearance to inside corner
12 in,. (46 cm)
9 in. (23 cm) We strongly recommend 12 in.
particularly where strong winds prevail.
H
Clearance to each side of center line
extended above a gas meter or regulator
3 ft. (91 cm) within a height 15 ft. above the
meter/regulator assembly
*
I
Clearance to service regulator vent outlet
3 ft. (91 cm)
*
J
Clearance to nonmechanical air supply inlet
to building or the combustion air inlet to
any other appliance
12 in. (30 cm)
9 in. (23 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)
3
*
M
Clearance under veranda, porch, deck, or
balcony
12 in. (30 cm)
4
12 in. (30 cm)
4
N
Clearance to propane tank relief valve and
filler connection
5 ft. (1.52 m)
5
/ 10 ft. (3.05 m)
6
5 ft. (1.52 m)
5
/ 10 ft. (3.05 m)
6
1) In accordance with the current CSA B149.1, Natural Gas and Propane
Installation Code.
2) In accordance with ANSI Z223.1/MNPA 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.
3) A vent shall not terminate directly above a sidewalk or driveway
which is located between two single family dwellings and serves both
dwellings.
4) Permitted only if veranda, porch, deck, or balcony is fully open on a
minimum of two sides beneath the floor.
5) Minimum clearance to tanks not filled on site.
6) Minimum clearance to tanks filled on site from bulk truck.
