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Figure 45
VENT CLEARANCES
Canadian Installations1
US Installations2
Canadian Installations1
US Installations2
A= Clearance above grade,
veranda, porch, deck, or
balcony
12 in (30 cm)
12 in (30cm)
I= Clearance to service
regulator vent outlet
3 ft (91 cm)
6 ft
B= Clearance to window or
door that may be open
6 in (15 cm) for appli-
ances ≤ 10,000 Btuh
(3 kW), 12 in (30 cm)
for appliances > 10,000
Btuh (3 kW) and ≤
100,000 Btuh (30 kW),
36 in (91 cm) for appli-
ances > 100,000 Btuh
(30 kW)
6 in (15 cm) for appli-
ances ≤ 10,000 Btuh (3
kW), 9 in (23 cm) for ap-
pliances > 10,000 Btuh
(3 kW) and ≤ 50,000
Btuh (15 kW), 12 in
(30 cm) for appliances >
50,000 Btuh (15 kW)
J= Clearance to nonme-
chanical air supply
inlet to building or the
combustion air inlet to
any other appliance
6 in (15 cm) for appli-
ances ≤ 10,000 Btuh (3
kW), 12 in (30 cm) for
appliances > 10,000
Btuh (3 kW) and ≤
100,000 Btuh (30 kW),
36 in (91 cm) for appli-
ances > 100,000 Btuh
(30 kW)
6 in (15 cm) for appli-
ances ≤ 10,000 Btuh
(3 kW), 9 in (23 cm) for
appliances > 10,000 Btuh
(3 kW) and ≤ 50,000 Btuh
(15 kW), 12 in (30 cm) for
appliances > 50,000 Btuh
(15 kW)
C= Clearance to
permanently
closed window
12 in (30 cm)
12 in (30 cm)
K= Clearance to a
mechanical air
supply inlet
6 ft (1.83 m)
3 ft (91 cm) above if
within 10 ft (3 m) hori-
zontally
D= Vertical clearance
ventilated soffit located
above the terminal within
a horizontal distance of
2 feet (61 cm) from the
center line of the terminal
24 in (61 cm)
24 in (61 cm)
L= Clearance above paved
sidewalk or paved
driveway located on
public property
7 ft (2.13 m) †
7 ft (2.13 m) †
E= Clearance to
unventilated
soffit
12 in (30 cm)
12 in (30 cm)
M= Clearance under
veranda, porch
deck, or balcony
12 in (30 cm) ‡
12 in (30 cm) ‡
F= Clearance to
outside corner
6 in (15 cm)
6 in (15 cm)
1
In accordance with the current CSA B149.1, Natural Gas and Propane Instal-
lation Code
G= Clearance
inside corner
9 in (23 cm)
9 in (23 cm)
2
In Accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas
Code
H= Clearance to each side
of center line extended
above meter/regulator
assembly
3 ft (91 cm) within a
height 15 ft (4.5 m)
above the meter/regula-
tor assembly
3 ft (91 cm)
†
A vent shall not terminate directly above a sidewalk or paved driveway that is
located between two single family dwellings and serves both dwellings
ATTENTION: Vinyl Soffit, Vinyl Ceiling, Vinyl Overhang
Disclaimer
Clearances are to heat resistant material (i.e. wood, metal). This
does not include vinyl. Empire Comfort Systems Inc. will not be held
responsible for heat damage caused from terminating under vinyl
overhangs, vinyl ceilings or vinyl ventilated/unventilated soffits.
‡
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, one of
the following shall be indicated:
Clearance in accordance with local installation codes and the requirements of the
gas supplier.
