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VENT TERMINAL
AIR SUPPLY INLET
AREA WHERE TERMINAL IS NOT PERMITTED
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 and the
manufacturer’s installation instructions.”
Figure 20. Vent Termination Clearances for Other Than Direct Vent Furnaces
Canadian Installations
1
US Installations
2
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
100,00 Btuh (30 kW), 36 inches (91 cm)
for appliances >100,00 Btuh (30 kW)
4 feet (1.2 m) below or to side of opening;
1 foot (300 mm) above opening
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
3 feet (91 cm) within a height 15 feet
above the 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
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)
4 feet (1.2 m) below or to side of opening;
1 foot (300 mm) above opening
K =
Clearance to a mechanical air supply inlet 6 feet (1.83 m) 3 feet (91 cm) above if within 10 feet
(3 m) horizontally
L =
Clearance above 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) ‡
*