22 AMP 400-1000L I&O Manual
VII(continued)
Canadian Installations
1
US Installations
2
A
Clearance above grade, veranda,
porch, deck, or balcony
12 in (30 cm)
B
Clearance to window or door that
may be opened
10,000 Btuh (3 kW), 12 in (30
cm) for appliances > 10,000 Btuh
kW), 36 in (91 cm) for appliances
>100,000 Btuh (30 kW)
6 in (15 cm) for appliances
cm) for appliances > 10,000 Btuh
kW), 12 in (30 cm) for appliances
> 50,000 Btuh (15 kW)
C
Clearance to permanently closed
window
* *
D
located above the terminal within a
horizontal distance of 2 ft (61 cm)
from the center line of the terminal.
* *
E * *
F Clearance to outside corner * *
G Clearance to inside corner * *
H
Clearance to each side of center
line extended above meter/regulator
assembly
3 ft (91 cm) within a height of
15 ft (4.6 m)
*
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
10,000 Btuh (3 kW), 12 in (30
cm) for appliances > 10,000 Btuh
kW), 36 in (91 cm) for appliances
>100,000 Btuh (30 kW)
10,000 Btuh (3 kW), 9 in (23 cm)
for appliances > 10,000 Btuh (3
12 in (30 cm) for appliances >
50,000 Btuh (15 kW)
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) †
7 ft (2.13 m) for mechanical draft
systems (Category I appliances).
Vents for Category II and IV
appliances cannot be located
above public walkways or other
areas where condensate or vapor
can cause a nuisance or hazard*
M
Clearance under veranda, porch
deck, or balcony
12 in (30 cm) ‡ *
* Clearance in accordance with local codes and the requirements of the gas supplier.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both
dwellings.
Notes:
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
clearance shall prevail.
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