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Vent Termination Restrictions
D E
B
L
F
1
Canadian Installation
A
12 in (30 cm)
B
12 in (30 cm)
C
12 in (30 cm)*
D
24 in (60 cm)
E
24 in (60 cm)
F
12 in (30 cm)*
G
12 in (30 cm)
H
3 ft (91 cm) within a
height of 15 ft (4.5 m)
above the meter/regulator
assembly
I
3 ft (91 cm)
J
12 in (30 cm)
K
6 ft (1.83 m)
7 ft (2.13 m )t
L
24 in (60 cm) +
M
N
12 in (30 cm)*
O
12 in (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.
* These numbers are only estimates.
t
A vent shall not terminate directly above a side walk or paved driveway that is located between two single family dwellings and it serves both dwellings.
+
Permitted only if verandah, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
B
C
Fixed
Closed
Fixed
Openable
Closed
Openable
J
B
A
Termination Cap
Air Supply Inlet
2
US Installation
Clearance above grade, verandah, porch, deck, or balcony.
9 in (23 cm)
Clearance from window or door that may be opened.
Clearance from permanently closed window (to prevent condensation).
Vertical clearance to ventilated soffit located above the terminal, within a horizontal distance of
2 ft (60 cm) from center line of terminal.
Clearance to unventilated soffit.
Clearance to outside corner.
Clearance to inside corner.
3 ft (91 cm) within a
Clearance to each side of center line extended above meter/regulator assembly.
height of 15 ft (4.5
m) above the meter/
regulator assembly*
3 ft (91 cm)*
Radial clearance around service regulator vent outlet.
9 in (23 cm)
Clearance to non-mechanical air supply inlet to building, or the combustion air inlet to any
other appliance.
3 ft (91 cm) above
Clearance to mechanical air supply inlet.
if within 10 ft (3 m)
horizontally
7 ft (2.13 m) *t
Clearance above paved sidewalk or paved driveway located on public property.
Clearance under verandah, porch, deck, or balcony.
Clearance horizontally to any surface (such as an exterior wall) for vertical terminations.
Clearance above roof line for vertical terminations.
H
B
G
G
Gas Meter
Restriction Zone
(Termination not allowed)
Description
N
O
G
M
K
I
A
Venting
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