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VENT TERMINAL
A = Clearance above grade, veranda, porch,
deck, or balcony
B = Clearance to window or door that may
be opened
C = Clearance to permanently closed window
D = Vertical clearance to ventilated soffi t
located above the terminal within a
horizontal distance of 2 feet (61 cm) from
the center line of the terminal
E = Clearance to unventilated soffi t
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 3 feet (1.83 m)
J = Clearance to nonmechanical air supply
inlet to building or the combustion air inlet
to any other appliance
K = Clearance to a mechanical air supply inlet 6 feet (1.83 m)
L = Clearance above paved sidewalk or
paved driveway located on public property
M = Clearance under veranda, porch deck,
or balcony
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 fl oor.
*
For clearances not specifi ed in ANSI Z223.1 / NFPA 54 or CSA B149.1, one of the following statement shall be included:
"Clearance in accordance with local installation codes, and the requirements of the gas supplier
Figure 14. Vent Termination Clearances for other than Direct Vent Furnaces
AIR SUPPLY INLET
Canadian Installations
12 inches (30 cm)
6 inches (15 cm) for appliances
10,000 Btuh (3 kW), 12 inches (30 cm)
for appliances > 10,000 Btuh (3 kW)
and 100,00 Btuh (30 kW), 36 inches
(91 cm) for appliances >100,00 Btuh
(30 kW)
*
*
*
*
*
3 feet (91 cm) within a height 15 feet
above the meter/regulator assembly
6 inches (15 cm) for appliances 10,000
Btuh (3 kW), 12 inches (30 cm) for
appliances > 10,000 Btuh (3 kW) and
100,00 Btuh (30 kW), 36 inches (91 cm)
for appliances >100,00 Btuh (30 kW)
7 feet (2.13 m) †
12 inches (30 cm) ‡
and the manufacturer's installation instructions."
AREA WHERE TERMINAL IS NOT PERMITTED
1
US Installations
12 inches (30 cm)
4 feet (1.2 m) below or to side of
opening; 1 foot (300 mm) above
opening
4 feet (1.2 m) below or to side of
opening; 1 foot (300 mm) above
opening
3 feet (91 cm) above if within 10 feet
(3 m) horizontally
7 feet (2.13 m)
2
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