38
88-A951X001-1D-EN
Non-Direct Vent Termination Clearances
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
6 inches (15 cm) for appliances ≤ 10,000
BTUH (3 kw), 12 inches (30 cm) for
appliances > 10,000 BTUH (3 kw) and ≤
100,000 BTUH (30 kw), 36 inches (91
cm) for appliances > 100,000 BTUH (30
kw)
4 feet (1.2m) below or to the side of
opening; 1 foot (0.3m) 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
3 feet (91 cm) with a height 15 feet (4.5
m) above the meter/regulator assembly
*
I=
Clearance to service regulator vent outlet
3 feet (91 cm)
*
J=
Clearance to nonmechanical air supply
inlet to building or the combustion air
inlet to any other appliance
6 inches (15 cm) for appliances ≤ 10,000
BTUH (3 kw), 12 inches (30 cm) for
appliances > 10,000 BTUH (3 kw) and ≤
100,000 BTUH (30 kw), 36 inches (91
cm) for appliances > 100,000 BTUH (30
kw)
4 feet (1.2 m) below or to side of opening;
1 foot (300 m) above opening
K=
Clearance to a mechanical air supply inlet
6 feet (1.83m)
3 feet (91 cm) above if within 10 feet
(3m) horizontally
L=
Clearance above a paved sidewalk or
paved driveway located on public
property
7 feet (2.13 m)
7 feet (2.13 m)
M=
Clearance under veranda, porch, deck, or
balcony
12 inches (30 cm)
*
Notes:
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 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.
* Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer's Installation
Instructions.
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