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Figure 11b. Direct Vent Terminal Clearances
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)
12 inches
(30 cm)
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)
12 inches
(30 cm)
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
12 inches
(30 cm) *a
12 inches
(30 cm) *a
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
12 inches
(30 cm) *a
12 inches
(30 cm) *a
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) ‡ 12 inches (30
cm) ‡
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”.