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3.3.4.4VENT TERMINAL LOCATIONS
Figure 14
A.
12’’ Clearance above grade, veranda, porch, deck or balcony
B.
12’’ Clearance to window or door that may be opened
C.
12’’ Clearance to permanently closed window
D.
18’’ Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 2
feet (60 cm) from the center-line of terminal (direct or corner installation)
24’’ Vertical clearance to ventilated soffit (Basement installation)
E.
12’’ Clearance to unventilated soffit, (straight out or corner installation)
24’’ Clearance to unventilated soffit, (Basement installation)
F.
12’’ Clearance to outside corner
G.
12’’ Clearance to inside corner
H.
Not to be installed above a meter/regulator assembly within 3 feet (90 cm) horizontally from the
center-line of the regulator.
I.
72’’ Clearance to service regulator vent outlet
J.
12’’ Clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other
appliance
K.
72’’ Clearance to a mechanical air supply inlet
L.
84’’ Clearance above paved sidewalk or a paved driveway located on public property. A vent shall not
terminate directly above a sidewalk or paved driveway which is located between two single family
dwellings and serves both dwelling
M.
12’’ Clearance under veranda, porch, deck, or balcony. Only permitted if veranda, porch, deck, or
balcony is fully open on a minimum of 2 sides beneath the floor.
N.
16” Clearance above the roof.
O.
24” Clearances from an adjacent wall including neighbouring buildings.
Local codes or regulations may require different clearances.
When the vent terminal is accessible, a certified guard shall be installed around the terminal.
The vent terminal may not be recessed into the wall or siding.
The vent terminal shall not be:
•
Within 3 ft. of a building mechanical air supply;
•
Less than 12 inches from a perpendicular wall;
•
Under a window that pivots open.
In addition, in a structure with three walls and a roof, the vent terminal should not be installed if:
•
The distance between the two sidewalls is less than 72";The roof exceed the walls by more than 24".
