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VENT TERMINAL
Clearance Location
Clearance above grade, veranda, porch, deck,
A =
balcony, or maximum expected snow level.
Clearance to window or door
B =
that may be opened.
C = Clearance to permanently closed window
Vertical clearance to ventilated soffit located
above the terminal within a horizontal distance
D =
of 2 feet (61cm) 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
H =
above 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 mechanical air supply inlet.
Clearance above paved sidewalk or driveway
L =
located on public property.
Clearance under veranda, porch, deck, or
M =
balcony.
a: In accordance with the current CSA B149.1 Natural Gas and Propane Installation Guide Code
b: In accordance with the current ANSI Z223.1 / NFPA 54 Natural Fuel Gas Code
c: A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
d: Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* For clearances not specified in ANSI Z223.1 / NFPA 54 or CSA B149.1, the following statement shall be included: "Clearance in accordance with local installation
codes, and the requirements of the gas supplier and the manufacturers installation instructions"
Venting Information
AIR SUPPLY INLET
CANADIAN INSTALLATIONS
Direct Vent (2-pipe) &
Conventional Vent (1-pipe)
Furnaces
12 inches (30cm)
6 inches (15cm) for
appliances < 10,000 Btuh (3kW)
12 inches (30cm) for appliances
10,000 Btuh - 100,000 Btuh (30kW)
36 inches (91cm) for
appliances > 100,000 Btuh (30Kw)
*
*
*
*
*
3 feet (91cm) within a height 15 feet
above the meter/regulator assembly
3 feet (1.83m)
6 inches (15cm) for
appliances < 10,000 Btuh (3kW)
12 inches (30cm) for appliances
10,000 Btuh - 100,000 Btuh (30kW)
36 inches (91cm) for
appliances > 100,000 Btuh (30Kw)
6 feet (1.83m)
c
7 feet (2.13m)
d
12 inches (30cm)
Table 16. Vent Termination Clearances
AREA WHERE TERMINAL IS NOT PERMITTED
a
US INSTALLATIONS
Direct Vent
(2-pipe) Furnaces
12 inches (30cm)
6 inches (15cm) for
appliances < 10,000 Btuh (3kW)
9 inches (23cm) for appliances
10,000 Btuh - 50,000 Btuh (30kW)
12 inches (30cm) for
appliances > 50,000 Btuh (30Kw)
*
*
*
*
*
*
*
6 inches (15cm) for
appliances < 10,000 Btuh (3kW)
9 inches (23cm) for appliances
10,000 Btuh - 50,000 Btuh (30kW)
12 inches (30cm) for
appliances > 50,000 Btuh (30Kw)
3 feet (91cm) above if within
10 feet (3m) horizontally
*
*
b
Conventional Vent
(1-pipe) Furnaces
12 inches (30cm)
4 ft. (1.2m) below or to side
of opening; 1 ft. (300mm)
above opening
*
*
*
*
*
*
*
4 ft. (1.2m) below or to side
of opening; 1 ft. (300mm)
above opening
3 ft. (91cm) above if within
10 feet (3m) horizontally
7 ft. (2.13m)
*
43
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