38
18-CE18D1-1A-EN
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)
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), 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)
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.
‡. 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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