Vent Terminal Clearances
Canadian installations
1
US installations
2
A
Clearance above grade, veranda,
porch, deck, or balcony
12 in (30 cm)
12 in (30 cm)
B
Clearance to window or door that
may be opened
6 in (15 cm) for appliances ≤ 10,000 Btu/h (3 kW),
12 in (30 cm) for appliances > 10,000 Btu/h (3
kW) and ≤ 100,000 Btu/h (30 kW), 36 in (91 cm)
for appliances > 100,000 Btu/h (30 kW)
6 in (15 cm) for appliances ≤ 10,000 Btu/h (3
kW), 9 in (23 cm) for appliances > 10,000 Btu/h
(3 kW) and ≤ 50,000 Btu/h (15 kW), 12 in (30
cm) for appliances > 50,000 Btu/h (15 kW)
C
Clearance to permanently closed
window
12 inches (30cm) recommended to prevent
condensation on window
12 inches (30cm). 9 inches (23cm) for
appliances 50,000 Btu’s and lower
D
Vertical clearance to ventilated soffit
located above the terminal within a
horizontal distance of 2 feet (61 cm)
from the center line of the terminal
18 inches (46cm)
18 inches (46cm)
E
Clearance to unventilated soffit
12 inches (30cm)
12 inches (30cm)
F
Clearance to outside corner
3” *
3” *
G
Clearance to inside corner
3” *
3” *
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) within a height 15 ft (4.5 m) above
the meter/regulator assembly
I
Clearance to service regulator vent
outlet
3 ft (91 cm)
3 ft (91 cm)*
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 Btu/h (3 kW),
12 in (30 cm) for appliances > 10,000 Btu/h (3
kW) and ≤ 100,000 Btu/h (30 kW), 36 in (91 cm)
for appliances > 100,000 Btu/h (30 kW)
6 in (15 cm) for appliances ≤ 10,000 Btu/h (3
kW), 9 in (23 cm) for appliances > 10,000 Btu/h
(3 kW) and ≤ 50,000 Btu/h (15 kW), 12 in (30
cm) for appliances > 50,000 Btu/h (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)
*(Notes: 2)
M
Clearance under veranda, porch
deck, or balcony
12 in (30 cm)‡
12 in (30 cm) *
N
Where a vent termination may cause
hazardous frost or ice accumulations on
adjacent property surfaces
**(Notes: 1)
*(Notes: 2)
O
Clearance above highest point of exit
on roof
18 in (45cm)
18 in (45cm)
P
Clearance to perpendicular or adjacent
wall
24 in (60cm)
24 in (60cm)
Notes:
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.
*
Clearance in accordance with local installation codes and the requirements of the
gas supplier.
**
A vent shall not terminate directly above a paved sidewalk or paved driveway that
is located between two single family dwellings and serves both dwellings. Note: This
does not apply to non-condensing appliances (Province of Ontario ONLY).
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of
two sides beneath the floor.
It is imperative that the vent termination be located observing the
minimum clearances as shown. There must not be any obstruction
such as bushes, garden sheds, fences, decks or utility buildings within
24” from the front of the termination plate.
Do not locate termination where excessive snow or ice build-up may
occur. Be sure to check vent termination area after snow falls and clear
to prevent accidental blockage of venting system. When using snow
blowers, make sure snow is not directed towards vent termination area.
Venting terminal shall not be recessed into a wall or siding. If finishing
the outside wall with vinyl or wood siding it is recommended that a Siding
Shield be installed, Part Number ZDVSSLR.
NOTE:
A HORIZONTAL VENT CERTIFIED GUARD (SAFETY CAGE) IS
AVAILABLE WHEN REQUIRED BY LOCAL CODES.
Clearances are to the
edge of the terminal
plate. Add 6-3/4” to
clearances to arrive at
centerline. Local codes
or regulations may
require different
clearances.
N
72
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