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FOR HORIZONTAL TERMINATION
D
E
L
Vent Terminal
V
MINIMUM DISTANCES
A = Clearance above the grade, a veranda, porch, deck, or balcony [*12" (305 mm) minimum].
B = Clearance to window or door that may be opened [*12" (305 mm) minimum].
C = Clearance to permanently closed window [*minimum 12" (305 mm) recommended to prevent condensation on
window]
D = Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of two (2) feet (610 mm)
from the centerline of the terminal [18" (457 mm) minimum].
E = Clearance to unventilated soffits [12" (305 mm) minimum]. Clearance to vinyl soffit [30" (762 mm)].
F = Clearance to an outside corner. See Figure 9.
G = Clearance to an inside corner. See Figure 9.
H = *Not to be installed above a gas meter/regulator assembly within three (3) feet (914 mm) horizontally from the centerline
of the regulator.
I = Clearance to service regulator vent outlet [*3' (914 mm) minimum].
J = Clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other appliance [*12" (305 mm)
minimum].
K = Clearance to a mechanical air supply inlet [*6' (1829 mm) minimum].
L = Clearance above a paved sidewalk or paved driveway located on public property [
M = Clearance under veranda, porch, deck, or balcony Refer to Figure 9 [*For Canada 12" (305 mm) minimum
*
As specified in CSA B149 Installation Codes. Note: Local codes or regulations may require different clearances.
** A vent must not terminate directly above a sidewalk 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 two sides beneath the floor.
Always maintain minimum clearances around vent systems. The minimum clearances
to combustibles for horizontal vent pipe are 3" at the top and 1" at the sides and bottom
of the vent system until the pipe penetrates the nearest vertical wall (1" required). A
1" minimum clearance all around the pipe must be maintained at outside wall and on
vertical runs. Do not pack the open air spaces with insulation or other materials. This
could cause high temperatures and may present a fire hazard.
74D0010
C
B
B
Fixed
V
Closed
F
Operable
V
B
Air Supply Inlet
A
Figure 8 - Horizontal Vent Termination Location
H
B
B
Opera-
Fixed
V
ble
Closed
V
V
A
B
A
J
Area Where Terminals Not Permitted
VENT INSTALLATION
Inside Corner Detail
G
V
A
I
M
V
A
A
K
**
7' (2133 mm) minimum].
G
***
].
15
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