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REFERENCE LETTER TO
DRAWING
A : Clearance
above
grade,
veranda,
)orch, deck, or balcony
B : Clearance
to window
or door that
may be opened
Vent Terminal
_._
Air Supply Inlet
[]
Area where terminal
is not permitted
VENT
TERMINAL
CLEARANCES
CANADIAN
INSTALLAI
12 Inches (30 cm)
12 Inches (30 cm)
C = Clearance
to permanently
closed
12 Inches (30 cm)
window
18 Inches (46 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
E : Clearance
to unventilated
soffit
F : Clearance
to outside corner
G : Clearance
to inside corner
H : Clearance
to each
side of center
line extended
above
meter/regulator
assembly
I : Clearance
to service regulator
vent
outlet
24 Inches (61 cm)
12 Inches (30 cm)
12 Inches (30 cm)
3 Feet (91 cm) within a height
15 Feet (4,5m) above
the meter,
assembly
3 Feet (91 cm)
J = Clearance
to nonmechanical
air
12 Inches (30 cm)
supply inlet to building
or the
combustion
air inlet to any other
appliance
K : Clearance
to a mechanical
air
6 Feet (1,83 m)
supply inlet
I. = Clearance
above
paved
sidewalk
or
paved
driveway
located
on public
property
M = Clearance
under veranda,
porch,
deck, or balcony
In accordance
with
the current
CSA-B149,1
Natural
Gas and
Prep(
7 Feet (2,13m)
A vent shall not l-
directly
above
a sidewalk
or pa_
driveway
that is located
betwe_
single family dwellings and serve
dwellings,
12 Inches (30 cm) permiffed
onl!
veranda,
porch, deck, or balcon
open on a minimum
of two side_
Page 4
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