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VENTING
Only For Qualified Installers
23
Requirements for Terminating the Venting
WARNING: Venting terminals must not be recessed
into a wall or siding.
In addition, the following must be observed:
A. The clearance above grade, or a veranda,
porch, deck or balcony must be a minimum of 12" (30
cm).
1
B. The clearance to a window or door that may be
opened must be a minimum of 12" (30 cm).
1
C. A 12" (30 cm) clearance to a permanently closed
window is recommended to prevent condensation on
the window.
D. The vertical clearance to a ventilated soffit lo-
cated above the terminal within a horizontal distance of
2 feet (60 cm) from the center-line of the terminal must
be a minimum of 18" (46 cm).
E. The clearance to an unventilated soffit must be
a minimum of 12" (30 cm).
F. The clearance to an outside corner is 11" from
center of pipe.
G. The clearance to an inside corner is 12" (30
cm).
H. A vent must not be installed within 3 feet (90
cm) above a meter/regulator assembly when measured
from the horizontal center-line of the regulator.
1
I. The clearance to service regulator vent outlet
must be a minimum of 6 feet (1.8 m).
1
J. The clearance to a non-mechanical air supply
inlet to the building or the combustion air inlet to any
other appliance must be a minimum of 12 inches (30
cm).
1
K. The clearance to a mechanical air supply inlet
must be a minimum of 6 feet (1.8 m).
1
L. The clearance above a paved sidewalk or a
paved driveway located on public property must be a
minimum of 7 feet (2.1 m).
1,2
M. The clearance under a veranda, porch, deck
or balcony must be a minimum of 12 inches (30 cm).
1,3
1
As specified in CAN 1 B1-149 Installation Codes
(current edition). Note: Local codes or regulations may
require different clearances.
2
A vent shall not terminate directly above a side-
walk or paved driveway which is located between two
single family dwellings and serves both dwellings.
3
Only permitted if veranda, porch, deck, or bal-
cony is fully open on a minimum of 2 sides beneath the
floor.
V
A
= Vent terminal = Air supply inlet
Fixed
Closed
Openable
Openable
Fixed
Closed
Inside
Corner
Detail
= Area where terminal is not permitted