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3-90-775R36_09/15
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Vent Information
A. Vent Termination Requirements
V
=Vent Terminal
A
=Air Supply Inlet
=Area where termination is not permitted
Door
Sidewalk
Fixed
Closed
Openable
Openable
Fixed
Closed
Inside Corner
Detail
Porch or
Openable
Deck
or Fixed
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 affect 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 12".
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.
(with
outside air installed, 9” 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 (607mm)
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".
H. A vent must not be installed within 3 feet (914mm) above
a gas meter/regulator assembly when measured from the
horizontal center-line of the regulator.
I. The clearance to service regulator vent outlet must be a
minimum of 6 feet.
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”.
K. The clearance to a mechanical air supply inlet must be a
minimum of 10 feet. (
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.
M. The clearance under a veranda, porch, deck or balcony
must be a minimum of 12".
(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.
Certain Canadian and or Local codes or regulations may
require different clearances.
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.
Only permitted if veranda, porch, deck, or balcony is fully
open on a minimum of 2 sides beneath the floor.
See NFPA 211 for more installation clearance reductions
when using outside air.
NOTE: In Canada, where passage through a wall or
partition of combustible construction is desired, the
installation shall conform to CAN/CSA-B365.
Chimney connector shall not pass through an attic or roof space, closet or
similar concealed space, or a floor or ceiling.
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