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Page 11
VENT TERMINATION CLEARANCES
Canadian Installations
US Installations
Canadian Installations
US Installations
A= Clearance above grade,
veranda, porch, deck, or
balcony
12 in (30 cm) minimum
12 in (30cm) minimum
I= Clearance to service
regulator vent outlet
3 ft (91 cm) minimum
6 ft (183 cm) minimum
B= Clearance to window or
door that may be open
12 in (30 cm) minimum
for appliances > 10,000
Btuh (3 kW) and ≤
100,000 Btuh (30 kW),
9 in (23 cm) minimum
for appliances > 10,000
Btuh(3 kW) and ≤
50,000 Btuh (15 kW)
J= Clearance to nonme-
chanical air supply
inlet to building or the
combustion air inlet to
any other appliance
12 in (30 cm) minimum for
appliances > 10,000 Btuh
(3 kW) and ≤ 100,000 Btuh
(30 kW)
9 in (23 cm) minimum
for appliances >
10,000 Btuh (3 kW)
and ≤ 50,000 Btuh
(15 kW)
C= Clearance to perma-
nently closed window
12 in (30 cm) minimum
12 in (30 cm) minimum
K= Clearance to a mechani-
cal air supply inlet
6 ft (1.83 m) minimum
3 ft (91 cm) minimum
above if within 10 ft
horizontally
D= Vertical clearance
ventilated soffit located
above the terminal within
a horizontal distance of 2
feet (61 cm) from the cen-
ter line of the terminal
18 in (45 cm) minimum
18 in (45 cm) minimum
L= Clearance above paved
sidewalk or paved drive-
way located on public
property
7 ft (2.13 m) minimum †
7 ft (2.13 m) minimum
E= Clearance to unventi-
lated soffit
12 in (30 cm) minimum
12 in (30 cm) minimum
M= Clearance under
veranda, porch deck, or
balcony
12 in (30 cm) minimum ‡
12 (30 cm) inches
minimum
F= Clearance to outside
corner
See page 10
See page 10
1
In accordance with the current CSA B149.1, Natural Gas and Propane Instal-
lation Code
G= Clearance inside corner
See page 10
See page 10
2
In Accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas
Code
H= Clearance to each side
of center line extended
above meter/regulator
assembly
3 ft (91 cm) minimum
within a height 15 ft
(4.5 m) above the
meter/regulator
assembly
3 ft (91 cm) minimum
†
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.
*
For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, one of
the following shall be indicated:
a)
A minimum clearance value determined by testing in accordance with section
2.23.5, or;
b)
A reference to the following footnote: “Clearance in accordance with local
installation codes and the requirements of the gas supplier.”
Figure 7