Installer’s Guide
Table 11 Non-Direct Vent Terminal 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.
‡. Pemitted 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.
Table 12 Direct Vent Terminal 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)
6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw),
9 inches (23 cm) for appliances > 10,000 Btuh (3 kw)
and =/< 50,000 Btuh (15 kw),
12 inches (30 cm) for appliances > 50,000 Btuh (15 kw)
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)
6 inches (15 cm) for appliances =/< 10,000 Btuh (3 kw),
9 inches (23 cm) for appliances > 10,000 Btuh (3 kw)
and =/< 50,000 Btuh (15 kw), 12 inches (30 cm) for appliances >
50,000 Btuh (15 kw)
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) † *
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.
‡. Pemitted 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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