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VENT TERMINATION CLEARANCES (CONT’D)
Canadian Installations1
US Installations2
Canadian Installations1 US Installations2
A= Clearance above grade,
veranda, porch, deck, or
balcony
12-in (30cm)
12-in (30cm)
I= Clearance to service
regulator vent outlet
3ft (91cm)
61-in
B= Clearance to window or
door that may be open
12-in (30cm) for
appliances >
10,000Btuh (3kW) and
≤ 100,000 Btuh (30kW)
9-in (23cm) for
appliances >
10,000Btuh
(3kW) and ≤ 50,000
Btuh (15kW)
J= Clearance to non-me
-
chanical air supply
inlet to building or the
combustion air inlet to
any other appliance
12-in (30cm) for
appliances > 10,000
Btuh (3kW) and ≤
100,000 Btuh (30kW)
9-in (23cm) for
appliances > 10,000Btuh
(3kW) and ≤ 50,000Btuh
(15kW)
C= Clearance to permanent
-
ly closed window
12-in (30cm)
12in (30cm)
K= Clearance to a me
-
chanical air supply inlet 6ft (1.83m)
3ft (91cm) above if within
10ft (3m) horizontally
D= Vertical clearance venti
-
lated soffit located above
the terminal within a hor
-
izontal distance of 2 feet
(61cm) from the center
line of the terminal
18-in
18-in
L= Clearance above
paved sidewalk or
paved driveway
located on public
property
7ft (2.13m) †
7ft (2.13m)
E= Clearance to unventilat
-
ed soffit
18-in
18-in
M= Clearance under
veranda, porch
deck, or balcony
12-in (30cm) ‡
12-in (30cm)
F= Clearance to outside
corner
See previous page.
1
In accordance with the current CSA B149.1, Natural Gas and Propane
Installation Code
G= Clearance inside corner
See previous page.
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
3ft (91cm) within a
height 15ft (4.5m)
above the meter/regula
-
tor assembly
3ft (91cm)
†
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 mini
-
mum 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.