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Figure 3.
Direct Vent Terminal Clearances
Canadian Installations
1
US Installations
2
A= Clearance above grade, veranda, porch, deck or balcony 12 inches (30 cm) 12 inches (30 cm)
B= Clearance to widow or door that may be opened 36 inches (91 cm) 12 inches (30 cm)
C= Clearance to permanently closed widow *b *b
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
E= Clearance to unventilated soffit 12 inches (30 cm) *a 12 inches (30 cm) *a
F= Clearance to outside corner *b *b
G= Clearance to inside corner *b *b
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
I= Clearance to service regulator vent outlet or oil tank vent 36 inches (91 cm) *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)
K= Clearance to a mechanical air supply inlet 6 feet (1.83 m)
3 feet (91 cm) above if
within 10 feet horizontally
L=
Clearance above paved sidewalk or paved driveway located on public
property
7 feet (2.13 m)† *b
M= Clearance under a veranda, porch, deck, or balcony 12 inches (30 cm) ‡ 12 inches (30 cm) ‡
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 must 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”.