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Vent / Air Intake Terminal Locations
Direct Vent Terminal Location
Plan the vent system layout so that proper clearances are maintained from plumbing and wiring. Before
the vent is installed, determine the vent pipe termination location as shown below in the Vent Terminal
Location illustration.
Figure 8. Vent / Air Intake Terminal Positions – Minimum Dimensions.
Table 6. Vent Installation Requirements.
Canadian
Installations
1
US
Installations
2
Canadian
Installations
1
US Installations
2
A
Clearance above
grade, veranda,
porch, deck or
balcony
12 inches (30 cm)
12 inches
(30 cm)
H
Clearance to each side of
center line extended above
meter/regulator assembly
36 inches (91 cm) within
a height 15 feet (4.6 m)
above the
meter/regulator
assembly
*b
B
Clearance to widow
or door that may be
opened
36 inches (91 cm)
for appliances >
100,000 Btuh (30
kW)
12 inches (30 cm)
for appliances >
50,000 Btuh (15
kW)
I
Clearance to service
regulator vent outlet or oil
tank vent
36 inches
(91 cm)
*b
C
Clearance to
permanently closed
widow
*b *b
J
Clearance to non-
mechanical air supply inlet
to building or the
combustion air inlet to any
other appliance
36 inches (91 cm) for
appliances > 100,000
Btuh (30 kW)
12 inches (30 cm) for
appliances > 50,000
Btuh (15 kW).
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
*b *b
K
Clearance to a mechanical
air supply inlet
6 feet
(1.83 m)
3 feet (91 cm) above
if within 10 feet
horizontally
E
Clearance to
unventilated soffit
*b *b
L
Clearance above paved
sidewalk or paved
driveway located on public
property
7 feet
(2.13 m)†
*b
F
Clearance to
outside corner
*b *b
M
Clearance under a
veranda, porch, deck, or
balcony
12 inches (30 cm) ‡ *b
G
Clearance to inside
corner
36 inches
(91 cm)*a
36 inches
(91 cm)*a
1
In accordance with the current CAN/CGA-B149 Installation Codes.
2
In accordance with the current ANSI Z223.1-(Latest Edition)/NFPA 54 National Fuel Gas Code.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single-family
dwellings and serves both dwellings.
‡ Permitted only if a veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor.
*a) A minimum clearance value determined by testing in accordance with section 2.20.
*b) “Clearance in accordance with local installation codes and the requirements of the gas supplier.”