15
Figure 3. Intake Vent Terminal Clearances (Referencing Other Appliance Venting Locations).
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
3 feet (91 cm) within a
height 15 feet (4.6 m)
above the
meter/regulator
assembly
*b
B=
Clearance to window
or door that may be
opened
36 inches (91
cm)
4 feet (1.2 m)
below or to the
side of opening;
12 inches (30
cm) above
opening
I=
Clearance to service
regulator vent outlet or
oil tank vent
36 inches
(91 cm)
*b
C=
Clearance to
permanently closed
window
*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)
4 feet (1.2m)
below or to side
of opening; 12
inches (30 cm)
above opening.
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)†
7 feet
(2.13 m)†
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
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”.
