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Table 4. Installation Clearances.
Ref Description
Canadian
Installations
US
Installations
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
36 inches
(91 cm)
12 inches
(30 cm)
C
Clearance to permanently closed
window
* *
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
* *
E Clearance to unventilated soffit * *
F Clearance to outside corner * *
G Clearance to inside corner * *
H
Clearance to each side of center
line extended above
meter/regulator assembly
3 feet (91 cm)
within a height
15 feet (4.5 m)
above the
meter/regulator
assembly
*
I
Clearance to service regulator vent
outlet
36 inches
(91 cm)
*
J
Clearance to non-mechanical air
supply inlet to building or the
combustion air inlet to any other
appliance
36 inches
(91 cm)
12 inches
(30 cm)
K
Clearance to a mechanical air
supply 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) ♦
*
M
Clearance under veranda, porch,
deck, or balcony
12 inches
(30 cm) ▲
*
♦ A vent shall not terminate directly above a sidewalk or paved driveway that is located between two
single family dwelling 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, clearances are in accordance
with local installation codes and the requirements of the gas supplier.