Figure 17B - Non-Direct Vent Termination Clearances
14 VENT TERMINATION CLEARANCES
NON DIRECT VENT TERMINATION CLEARANCES
Clearance Canadian Installations - 1 US Installations -2
A =
Clearance above grade, veranda, porch,
deck, or balcony
12 inches (30cm) 12 inches (30cm)
B =
Clearance to window or door that may be
opened
6 inches (15cm) for appliances
< 10,000 Btuh (3kW),
12 inches (30 cm) for appliances > 10,000 Btuh (3kW) and
< 100,000 Btuh (30kW),
36 inches (91cm) for appliances > 100,000 Btuh (30kW)
4 feet (1.2 m) below or to side of opening; 1 foot (30 cm)
above opening
C =
Clearance to permanently closed window
*
*
D =
Vertical clearance to ventilated so t located
above the termination within a horizontal
distance of 2 feet (61 cm) from the center
line of the termination
**
E =
Clearance to unventilated so t * *
F =
Clearance to outside corner * *
G =
Clearance to inside corner * *
H =
Clearance to each side of center line ex-
tended above meter/regulator assembly
3 feet (91 cm) within a height 15 feet (4.5 m) above the
meter/regulator.
*
I =
Clearance to service regulator vent outlet 3 feet (91 cm) *
J =
Clearance to non-mechanical air supply
inlet to building or the combustion air inlet
to any other appliance
6 inches (15 cm) for appliances < 10,000 Btuh (3kW),
12 inches (30 cm) for appliances > 10,000 Btuh (3kW) 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 (30 cm)
above opening
K =
Clearance to mechanical air supply inlet 6 feet (1.83 m) 3 feet (91 cm) above if within 10 feet (3m) horizontally
L =
Clearance above paved sidewalk or paved
driveway located on public property
7 feet ( 2.13m) + 7 feet (2.13m)
M =
Clearance under veranda, porch, deck or
balcony
12 inches (30 cm) ++ *
1 In accordance with the current CSA B149.1.1, 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 dwell-
ings.
++ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the oor
* For clearances not speci ed 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 manufacturer's installation instructions."
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