27
3-90-00674R20_08/12
H. A vent must not be installed within 3 feet (90 cm)
above a gas 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
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 48”.
1
K. The clearance to a mechanical air supply inlet
must be a minimum of 10 feet.
1
(
with outside air
installed, 6 feet
)
L. The clearance above a paved sidewalk or a paved
driveway located on public property must be a
minimum of 7 feet.
1,2
M. The clearance under a veranda, porch, deck or
balcony must be a minimum of 12 inches.
1,3
(b.
also)
NOTE: The clearance to vegetation and other
exterior combustibles such as mulch is 36” as
measured from the center of the outlet or cap. This
36” radius continues to grade or a minimum of 7
feet below the outlet.
1
Certain Canadian and or 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 balcony is
fully open on a minimum of 2 sides beneath the floor.
venting
requirements for Terminating the venting
wArNINg: venting terminals must not be recessed
into a wall or siding.
NOTE: Only Pl or l vent pipe wall pass-throughs
and fire stops should be used when venting through
combustible materials.
NOTE: Always take into consideration the effect
the prevailing wind direction or other wind currents
will cause with flyash and /or smoke when placing
the termination.
In addition, the following must be observed:
A. The clearance above grade must be a minimum
of 18".
1
B. The clearance to a window or door that may be
opened must be a minimum of 48" to the side and
48" below the window/door, and 12" above the
window/door.
1
(
with outside air installed, 18” to
side and below
)
C. A 12" clearance to a permanently closed window
is recommended to prevent condensation on the
window.
D. The vertical clearance to a ventilated soffit located
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".
E. The clearance to an unventilated soffit must be a
minimum of 12".
F. The clearance to an outside corner is 11" from center
of pipe.
G. The clearance to an inside corner is 12".
NOTE: where passage through a wall, or partition of
combustible construction is desired, the installation
shall conform to CAN/CSA-b365. (if in Canada)
= Vent terminal
= Air Supply Inlet
= Area where termination is not permitted