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Canadian Installations1
A= Clearance above grade,
12 in (30 cm)
veranda, porch, deck, or
balcony
B= Clearance to window or
6 in (15 cm) for appli-
door that may be open
ances ≤ 10,000 Btuh
(3 kW), 12 in (30 cm)
for appliances > 10,000
Btuh (3 kW) and ≤
1000,000 Btuh (30 kW),
36 in (91 cm) for appli-
ances > 100,000 Btuh
(30 kW)
C= Clearance to perma-
nently closed window
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
E= Clearance to unventi-
lated soffit
F= Clearance to outside
corner
G= Clearance inside corner
H= Clearance to each side
3 ft (91 cm) within a
of center line extended
height 15 ft (4.5 m)
above meter/regulator
above the meter/regula-
assembly
tor assembly
Page 30
VENT TERMINAL CLEARANCES
US Installations2
12 in (30cm)
6 in (15 cm) for appli-
ances ≤ 10,000 Btuh (3
kW), 9 in (23 cm) for ap-
pliances > 10,000 Btuh
(3 kW) and ≤ 50,000
Btuh (15 kW), 12 in
(30 cm) for appliances >
50,000 Btuh (15 kW)
*
*
*
*
*
*
*
*
*
*
*
I= Clearance to service
regulator vent outlet
J= Clearance to nonme-
chanical air supply
inlet to building or the
combustion air inlet to
any other appliance
K= Clearance to a mechani-
cal air supply inlet
L= Clearance above paved
sidewalk or paved drive-
way located on public
property
M= Clearance under
veranda, porch deck, or
balcony
1
In accordance with the current CSA B149.1, Natural Gas and Propane Instal-
lation Code
2
In Accordance with the current ANZI Z223.1/NFPA 54, National Fuel Gas
Code
†
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 ANZI 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 60
Canadian Installations1
US Installations2
3 ft (91 cm)
6 in (15 cm) for appli-
6 in (15 cm) for appli-
ances ≤ 10,000 Btuh (3
ances ≤ 10,000 Btuh
kW), 12 in (30 cm) for
(3 kW), 9 in (23 cm) for
appliances > 10,000
appliances > 10,000 Btuh
Btuh (3 kW) and ≤
(3 kW) and ≤ 50,000 Btuh
1000,000 Btuh (30 kW),
(15 kW), 12 in (30 cm) for
36 in (91 cm) for appli-
appliances > 50,000 Btuh
ances > 100,000 Btuh
(15 kW)
(30 kW)
6 ft (1.83 m)
3 ft (91 cm) above if
within 10 ft (3 m) hori-
zontally
7 ft (2.13 m) †
12 in (30 cm) ‡
*
*
*
32261-5-0414
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