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Page 27
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)
3 ft (91 cm)
B= Clearance to window or
door that may be open
12 in (30 cm) for appli
-
ances > 10,000 Btuh
(3 kW) and ≤ 100,000
Btuh (30 kW)
9 in (23 cm) for appli
-
ances > 10,000 Btuh
(3 kW) and ≤ 50,000
Btuh (15 kW)
J= Clearance to nonme
-
chanical air supply
inlet to building or the
combustion air inlet to
any other appliance
12 in (30 cm) for appli
-
ances > 10,000 Btuh (3
kW) and ≤ 100,000 Btuh
(30 kW)
9 in (23 cm) for appli
-
ances > 10,000 Btuh
(3 kW) and ≤ 50,000 Btuh
(15 kW)
C= Clearance to perma
-
nently closed window
12 in (30 cm)
12 in (30 cm)
K= Clearance to a mechani
-
cal 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 cen
-
ter line of the terminal
18 in (45 cm)
18 in (45 cm)
L= Clearance above paved
sidewalk or paved drive
-
way located on public
property
7 ft (2.13 m) †
7 ft (2.13 m)
e= Clearance to unventi
-
lated soffit
12 (30 cm)
12 (30 cm)
m= Clearance under
veranda, porch deck, or
balcony
12 in (30 cm) ‡
12 in (30 cm)
F= Clearance to outside
corner
See page 30
See page 30
1
In accordance with the current CSA B149.1, Natural Gas and Propane Instal
-
lation Code
G= Clearance inside corner
See page 30
See page 30
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 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: Clearance
must be in accordance with local installation codes and the requirements of the gas
supplier.
