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Figure 4
Direct Vent Terminal Clearances
Canadian Installations1 US Installations2
A=
Clearance above grade, veranda, porch, deck or
balcony
12 inches (30 m) 12 inches (30 cm)
B= Clearance to widow or door that may be opened 12 inches (30 m)
9 inches (23 cm) for
appliances > 10,000 Btuh
(3 kW) and ≤ 50,000
Btuh (15 kW), 12 inches
(30 cm) for appliances >
50,000 Btuh (15 kW)
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
12 inches (30 cm)
9 inches (23 cm) for
appliances > 10,000 Btuh
(3 kW) and ≤ 50,000
Btuh (15 kW), 12 inches
(30 cm) for appliances >
50,000 Btuh (15 kW)
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) ‡ *b