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D E
B
L
F
Termination Cap
Letter
Canadian Installation
A
B
12 in (30 cm)
C
D
E
F
G
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
M
N
O
1 In accordance with the current CSA B149, 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.
Clearances are in accordance with local installation codes and the requirements of the gas supplier.
Installation - Termination Restrictions & Clearances
Figure 6: Vent Termination Restrictions
B
C
B
Fixed
Closed
Fixed
Openable
Closed
Openable
J
B
A
Air Supply Inlet
Table 4: Vent Termination Clearances
1
US Installation
12 in (30 cm)
9 in (23 cm)
12 in (30 cm)*
0 in (0 cm)
0 in (0 cm)
12 in (30 cm)*
4 in (10.2 cm)
3 ft (91 cm) within a height of
15 ft (4.5 m) above the meter/
regulator assembly*
3 ft (91 cm)*
9 in (23 cm)
3 ft (91 cm) above if within 10
ft (3 m) horizontally
7 ft (2.13 m) *t
+
0 in (0 cm)
12 in (30 cm)*
12 in (30 cm)
H
G
M
I
Restriction Zone
G
Gas Meter
(Termination not allowed)
2
Clearance above grade, verandah, porch, deck, or balcony.
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.
Clearance to each side of center line extended above me-
ter/regulator assembly.
Radial clearance around service regulator vent outlet.
Clearance to non-mechanical air supply inlet to building, or
the combustion air inlet to any other appliance.
Clearance to mechanical air supply inlet.
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.
N
O
G
K
A
Description
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