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Page 25 43115-2-0821 43115-2-0821
Figure 37
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
B= Clearance to window or
door that may be open
12 in (30 cm) for
appliances > 10,000
Btuh (3 kW) and ≤
100,000 Btuh (30 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)
J= Clearance to
nonmechanical air
supply inlet to building
or the combustion
air inlet to any other
appliance
12 in (30 cm) for
appliances > 10,000
Btuh (3 kW) and ≤
100,000 Btuh (30 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) 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
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) L= Clearance above paved
sidewalk or paved
driveway located on
public property
7 ft (2.13 m) † 7 ft (2.13 m) †
E= Clearance to
unventilated soffit
12 in (30 cm) 12 in (30 cm) M= Clearance under
veranda, porch
deck, or balcony
12 in (30 cm) ‡ 12 in (30 cm) ‡
F= Clearance to outside
corner
6 in (15 cm) 6 in (15 cm) 1 In accordance with the current CSA B149.1, Natural Gas and Propane
Installation Code
G= Clearance inside corner 9 in (23 cm) 9 in (23 cm) 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/
regulator 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, one
of the following shall be indicated:
Clearance in accordance with local installation codes and the requirements of the
gas supplier.