19
Canadian Installations (1) US Installations (2)
A= Clearance above
grade, veranda, porch,
deck, or balcony
12 in (30 cm)
12 in (30cm)
B= Clearance to
window or door that
may be open
6 in (15 cm) for
appliances ≤ 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 appliances
> 100,000 Btuh (30
kW)
6 in (15 cm) for
appliances
≤ 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)
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)
E= Clearance to
unventilated soffit
12 in (30 cm)
12 in (30 cm)
F= Clearance to
outside
corner
6 in (15 cm)
6 in (15 cm)
G= Clearance inside
corner
9 in (23 cm)
9 in (23 cm)
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/
regulator assembly
3 ft (91 cm)
I= Clearance to
service regulator vent
outlet
3 ft (91 cm)
6 ft
VENT TERMINATION CLEARANCES (CONT’D)
J= Clearance to non-
mechanical
air supply inlet to
building or the
combustion air
inlet to any other
appliance
6 in (15 cm) for
appliances
≤ 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
appliances
> 100,000 Btuh (30
kW)
6 in (15 cm) for
appliances
≤ 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)
K= Clearance to a
mechanical air supply
inlet
6 ft (1.83 m)
3 ft (91 cm) above
if within 10 ft (3 m)
horizontally
L= Clearance above
paved sidewalk or
paved driveway
located on public
property
7 ft (2.13 m) †
7 ft (2.13 m) †
M= Clearance under
veranda, porch deck,
or balcony
12 in (30 cm) ‡
12 in (30 cm) ‡
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 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.
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.