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Canadian Installations1
A= Clearance above grade,
veranda, porch, deck, or
12 in (30 cm)
balcony
B= Clearance to window or
6 in (15 cm) for appli-
door that may be open
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)
C= Clearance to
permanently
12 in (30 cm)
closed window
D= Vertical clearance
ventilated soffit located
above the terminal within
24 in (61 cm)
a horizontal distance of
2 feet (61 cm) from the
center line of the terminal
E= Clearance to
unventilated
12 in (30 cm)
soffit
F= Clearance to
6 in (15 cm)
outside corner
G= Clearance
9 in (23 cm)
inside corner
H= Clearance to each side
3 ft (91 cm) within a
of center line extended
height 15 ft (4.5 m)
above meter/regulator
above the meter/regula-
assembly
tor assembly
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.
Page 34
VENT CLEARANCES
Figure 45
US Installations2
I= Clearance to service
12 in (30cm)
regulator vent outlet
6 in (15 cm) for appli-
J= Clearance to nonme-
ances ≤ 10,000 Btuh (3
chanical air supply
kW), 9 in (23 cm) for ap-
inlet to building or the
pliances > 10,000 Btuh
combustion air inlet to
(3 kW) and ≤ 50,000
any other appliance
Btuh (15 kW), 12 in
(30 cm) for appliances >
50,000 Btuh (15 kW)
K= Clearance to a
12 in (30 cm)
mechanical air
supply inlet
L= Clearance above paved
sidewalk or paved
driveway located on
24 in (61 cm)
public property
M= Clearance under
12 in (30 cm)
1
6 in (15 cm)
2
9 in (23 cm)
†
3 ft (91 cm)
‡
*
Clearance in accordance with local installation codes and the requirements of the
gas supplier.
Canadian Installations1
3 ft (91 cm)
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 ft (1.83 m)
7 ft (2.13 m) †
veranda, porch
12 in (30 cm) ‡
deck, or balcony
In accordance with the current CSA B149.1, Natural Gas and Propane Instal-
lation Code
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 floor.
For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, one of
the following shall be indicated:
US Installations2
6 ft
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)
3 ft (91 cm) above if
within 10 ft (3 m) hori-
zontally
7 ft (2.13 m) †
12 in (30 cm) ‡
30786-13-0618
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