19
TERMINATION CLEARANCES SIDEWALL POWER VENT
Fixed
Closed
Operable
Fixed
closed
Operable
B
V
V
V
V
V
V
V
V
C
B
B
X
A
M
K
Regulator vent outlet
In the event no
regulator is present,
H and I can be
disregarded
.
V
Legend:
= Vent terminal
X
= Air supply inlet
= Area where terminal is not permitted
B
B
J
F
X
B
L
E
D
Inside
corner detail
V
A
G
H
15 ft
I
Figure 15. Sidewall Power Direct Vent Using Outside Air
Table 8. Termination Clearances for Sidewall Power Vent
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)
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 appli-
ances > 100,000 Btuh
(30 kW)
•
6 in (15 cm) for appli-
ances ≤ 10,000 Btuh
(3 kW)
•
9 in (23 cm) for appli-
ances >10,000 Btuh (3
kW) and ≤ 50,000 Btuh
(15 kW)
•
12 in (30 cm) for appli-
ances > 50,000 Btuh
(15 kW)
C
Clearance to
permanently closed
window
12 inches (30 cm)*
12 inches (30 cm)*
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)*
E
Clearance to unven-
tilated soffit
12 inches (30 cm)*
12 inches (30 cm)*
F
Clearance to out-
side corner
2 feet (60 cm)*
2 feet (60 cm)*
G
Clearance to inside
corner
18 inches (45 cm)*
18 inches (45 cm)*
Table 8. Termination Clearances for Sidewall Power Vent
Type of Clearance
Canadian Installations
1
US Installations
2
H
Clearance to each
side of center line
extended above
meter/regulator as-
sembly
3 ft (91 cm) within a
height of 15 ft (4.6 m)
Clearance in accordance
with local installation
codes and the require-
ments of the gas supplier
I
Clearance to service
regulator vent outlet
3 ft (91 cm)
Clearance in accordance
with local installation
codes and the require-
ments of the gas supplier
J
Clearance to a non
mechanical air sup-
ply inlet into building
or combustion air
inlet to any other
appliance
•
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 appli-
ances >100,000 Btuh
(30 kW)
•
6 in (15 cm) for appli-
ances ≤ 10,000 Btuh
(3 kW)
•
9 in (23 cm) for appli-
ances >10,000 Btuh (3
kW) and ≤ 50,000 Btuh
(15 kW)
•
12 in (30 cm) for appli-
ances > 50,000 Btuh
(15 kW)
K
Clearance to a
mechanical air sup-
ply inlet
6 feet (1.83 m)
3 feet (91 cm) above
if within 10 feet (3 m)
horizontally
L
Clearance above
paved sidewalk or
paved driveway
located on public
property
7 feet (2.13 m)†
7 ft (2.13 m) for me-
chanical draft systems
(Category I appliances);
vents for Category II and
IV appliances cannot
be located above public
walkways or other areas
where condensate or va-
por can cause a nuisance
or hazard
M
Clearance under
veranda, porch,
deck, or balcony
12 inches (30 cm) ‡
12 inches (30 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 can cause hazardous frost o 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
