37
TERMINATION CLEARANCES SIDEWALL POWER VENT
G
H
C
D
E
L
B
B
B
B
J
I
B
B
F
M
K
Figure 51. Power Vent Using Room Air
Vent terminal clearances for “Power Vent” installations. Power Vent configurations use room air for combustion.
Type of Clearance
Canadian
Installations
1
US
Installations
2
Type of Clearance
Canadian
Installations
1
US
Installations
2
A
Clearance above grade,
veranda, porch, deck or
balcony
12 inches (30 cm)
12 inches (30
cm)
H
Clearance to each side
of center line extended
above meter/regulator
assembly
Clearance in accordance with
local installation codes and
the requirements of the gas
supplier
Clearance in accor-
dance with local in-
stallation codes and
the requirements of
the gas supplier
B
Clearance to window or
door that may be opened
•
6 in (15 cm) for appli-
ances ≤ 10,000 Btuh (3
kW)
•
12 in (30 cm) for appli-
ances > 10,000 Btuh (3
kW) and ≤ 100,000 Btuh
•
(30 kW), 36 in (91 cm)
for appliances > 100,000
Btuh (30 kW)
4 feet (1.2 m)
below or to side
of opening;
1 foot (30 cm)
above opening
I
Clearance to service
regulator vent outlet
Above a regulator within 3 ft
(91 cm) horizontally of the ver-
tical center line of the regulator
vent outlet to a maximum verti-
cal distance of 15 ft (4.5 m)
Clearance in accor-
dance with local in-
stallation codes and
the requirements of
the gas supplier
C
Clearance to permanent-
ly closed window
12 inches (30 cm)*
12 inches (30
cm)*
J
Clearance to a non
mechanical air supply
inlet into building or
combustion air inlet to
any other appliance
•
6 in (15 cm) for appliances
≤ 10,000 Btuh (3 kW)
•
12 in (30 cm) for appli-
ances > 10,000 Btuh (3
kW) and ≤ 100,000 Btuh
(30 kW)
•
36 in (91 cm) for appli-
ances >100,000 Btuh
(30 kW)
4 feet (1.2 m) below
or to side of opening;
1 foot (30 cm) above
opening.
D
Vertical clearance to
ventilated soffit located
above the terminal within
a horizontal distance of
2 feet (61 cm) from the
center line of the terminal
12 inches (30 cm)*
12 inches (30
cm)*
K
Clearance to a me-
chanical air supply inlet 6 feet (1.83 m)
3 feet (91 cm) above
if within 10 feet (3 m)
horizontally
E
Clearance to unventi-
lated soffit
12 inches (30 cm)*
12 inches (30
cm)*
L
Clearance above
paved sidewalk or
paved driveway located
on public property
7 feet (2.13 m)†
7 feet (2.13 m)
F
Clearance to outside
corner
2 feet (60 cm)*
2 feet (60 cm)*
M
Clearance under
veranda, porch, deck,
or balcony
12 inches (30 cm) ‡
12 inches (30 cm) ‡
G
Clearance to inside
corner
18 inches (45 cm)*
18 inches (45
cm)*
1. In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2. In accordance with the current ANSI 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
Where it may cause hazardous frost or ice accumulations on adjacent property surfaces.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer's installation instructions
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