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Figure 22
VENT TERMINAL CLEARANCES
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)
6ft
B= Clearance to window or
door that may be open
6-in (15cm) for appli-
ances ≤ 10,000 Btuh
(3kW), 12-in (30cm) for
appliances > 10,000
Btuh (3kW) and ≤
100,000 Btuh (30kW),
36-in (91cm) for appli-
ances > 100,000 Btuh
(30kW)
6-in (15cm) for appli-
ances ≤ 10,000 Btuh
(3kW), 9-in (23cm) for
appliances > 10,000
Btuh (3kW) and ≤
50,000 Btuh (15kW),
12-in (30cm) for appli-
ances > 50,000 Btuh
(15kW)
J= Clearance to nonme-
chanical air supply
inlet to building or the
combustion air inlet to
any other appliance
6-in (15cm) for appli-
ances ≤ 10,000 Btuh
(3kW), 12-in (30cm) for
appliances > 10,000
Btuh (3kW) and ≤
100,000 Btuh (30kW),
36-in (91cm) for appli-
ances > 100,000 Btuh
(30kW)
6-in (15cm) for appli-
ances ≤ 10,000 Btuh
(3kW), 9-in (23cm) for
appliances > 10,000
Btuh (3kW) and ≤
50,000 Btuh (15kW),
12-in (30 cm) for appli-
ances > 50,000 Btuh
(15kW)
C= Clearance to
permanently
closed window
12-in (30cm)
12-in (30cm)
K= Clearance to a
mechanical air
supply inlet
6ft (1.83m)
3ft (91cm) above if
within 10ft (3m)
horizontally
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 (61cm)
24-in (61cm)
L= Clearance above
paved sidewalk or
paved driveway
located on public
property
7ft (2.13m) †
7ft (2.13m) †
E= Clearance to
unventilated
soffit
12-in (30cm)
12-in (30cm)
M= Clearance under
veranda, porch
deck, or balcony
12-in (30cm) ‡
12-in (30cm) ‡
F= Clearance to
outside corner
6-in (15cm)
6-in (15cm)
1
In accordance with the current CSA B149.1, Natural Gas and Propane
Installation Code
G= Clearance
inside corner
9-in (23cm)
9-in (23cm)
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.
