Filter
Top Products
REFERENCE LETTER TO
DRAWING
CANADIAN INSTALLA
T
A
= Clearance above grade, veranda,
porch, deck, or balcony
12 Inches (30 cm)
B
= Clearance to window or door that
may be opened
12 Inches (30 cm)
C
= Clearance to permanently closed
window
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
18 Inches (46 cm)
E
= Clearance to unventilated soffit 24 Inches (61 cm)
F
= Clearance to outside corner 12 Inches (30 cm)
G
= Clearance to inside corner 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 (4.5m) above the meter
/
assembly
I
= Clearance to service regulator vent
outlet
3 Feet (91 cm)
J
= Clearance to nonmechanical air
supply inlet to building or the
combustion air inlet to any other
appliance
12 Inches (30 cm)
K
= Clearance to a mechanical air
supply inlet
6 Feet (1.83 m)
L
= Clearance above paved sidewalk or
paved driveway located on public
property
7 Feet (2.13m) A vent shall not t
e
directly above a sidewalk or pa
v
driveway that is located betwe
e
single family dwellings and serv
e
dwellings.
M
= Clearance under veranda, porch,
deck, or balcony
12 Inches (30 cm) permitted onl
y
veranda, porch, deck, or balcon
open on a minimum of two side
s
¹ In accordance with the current CSA-B149.1 Natural Gas and Pro
pa
Vent Terminal
Air Supply Inlet Area where terminal is not permitted
VENT TERMINAL CLEARANCES
Page 4