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Figure 11a. Vent Terminal Clearances (Other than Direct Vent or “Power Vented” Installations)
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
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”.