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Indirect Venting
Ref
Description
Clearance above grade, veranda, porch, deck, or
A
balcony
B
Clearance to window or door that may be opened
C
Clearance to permanently closed window
Vertical clearance to ventilated soffit located above
D
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
Clearance to each side of center line extended above
H
meter/regulator assembly
I
Clearance to service regulator vent outlet
Clearance to non-mechanical air supply inlet to
J
building or the combustion air inlet to any other
appliance
K
Clearance to a mechanical air supply inlet
Clearance above paved sidewalk or paved driveway
L
located on public property
M
Clearance under veranda, porch deck, or balcony
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.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Suggested minimum clearances by the manufacturer. If the clearances required by the local authority or gas supplier are
different from those from the table above, the greater clearance should apply.
Canadian Non-Direct
US Non-Direct Vent
Vent Installations
Installations
1
12 in (30 cm)
12 in (30 cm)
48 in (120 cm) below or
36 in (91 cm)
to side of opening; 12 in
(30 cm) above opening
12 in (30 cm)*
12 in (30 cm)*
3 ft (91 cm)*
3 ft (91 cm)*
3 ft (91 cm)*
3 ft (91 cm)*
2 ft (61 cm)*
2 ft (61 cm)*
12 in (30 cm)*
12 in (30 cm)*
36 in (91 cm) within a
height 15 ft (4.57 m)
3 ft (91 cm) within a
above the meter/
height of 15 ft (4.6 m)*
regulator assembly
36 in (91 cm)
3 ft (91 cm)*
48 in (120 cm) below or
36 in (91 cm)
to side of opening; 12 in
(30 cm) above opening
36 in (91 cm) above
6 ft (1.83 m)
if within 10 ft (3 m)
horizontally
7 ft (2.13 m)
7 ft (2.13 m)
†
12 in (30 cm) - open on
12 in (30 cm)
‡
3 sides*
Installing a Common Vent System
2
†
89
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