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6.5.1 Clearance Requirements from Vent Terminations to Building Openings
[Other than Direct Vent]
Vent Terminal
Air Supply Inlet
Area Where Terminal is Not Permitted
Mechanical air
supply inlet
[ K for US ]
Ventilated soffit
located
[ D ]
Less than 2 ft
Less than 10 ft
3 ft
or more
Ref Description
Canadian Non-Direct Vent Installations
1
US Non-Direct Vent Installations
2
A Clearance above grade, veranda, porch, deck, or
balcony
12 in. (30 cm) 12 in. (30 cm)
B Clearance to window or door that may be
opened
6 in. (15 cm) for appliances
12 in. (30 cm) for appliances
> 10,000 Btuh (3kW) and
36 in. (91 cm) for appliances
> 100,000 Btuh (30 kW)
4 ft (1.2 m) below or to side of
opening;
1 ft (300 mm) above opening
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
* *
I Clearance to service regulator vent outlet Above a regulator within 3 ft (91 cm)
horizontally of the vertical center
line of the regulator vent outlet to a
maximum vertical distance of 15 ft
(4.5 m)
*
J Clearance to non-mechanical air supply inlet to
building or the combustion air inlet to any other
appliance
6 in. (15 cm) for appliances
12 in. (30 cm) for appliances
> 10,000 Btuh (3kW) and
36 in. (91 cm) for appliances
> 100,000 Btuh (30 kW)
4 ft (1.2 m) below or to side of
opening;
1 ft (300 mm) above opening
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)† *
M
Clearance under veranda, porch, deck, or balcony
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
† 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.
*
Clearance in accordance with local installation codes and the requirements of the gas supplier. Clearance to opposite wall is 24 in. (60 cm).
• All clearance requirements are in accordance with ANSI Z21.10.3 and the National Fuel Gas Code, ANSI
Z223.1 and in Canada, in accordance with the Natural Gas and Propane Installation Code CSA B149.1.
6.5 Vent Pipe Installation (Non-Direct Vent)
Venting the Water Heater
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