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VENT INSTALLATION
FOR HORIZONTAL TERMINATION
D
E
L
Vent Terminal
V
MINIMUM DISTANCES
A = Clearance above the grade, a veranda, porch, deck, or balcony [*12" (305mm) minimum].
B = Clearance to window or door that may be opened [*12" (305mm) minimum].
C = Clearance to permanently closed window [*minimum 12" (305mm) recommended to prevent condensation on
window]
D
= Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of two (2) feet (610mm)
from the centerline of the terminal [18" (457mm) minimum].
E
= Clearance to unventilated soffits [12" (305mm) minimum]. Clearance to vinyl soffit [30" (762mm)].
F = Clearance to an outside corner. See Figure 13, page 17.
G = Clearance to an inside corner. See Figure 13, page 17.
H = *Not to be installed above a gas meter/regulator assembly within three (3) feet (914mm) horizontally from the centerline
of the regulator.
I = Clearance to service regulator vent outlet [*3' (914mm) minimum].
J = Clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other appliance [*12" (305mm)
minimum].
K = Clearance to a mechanical air supply inlet [*6' (1829mm) minimum].
L
= Clearance above a paved sidewalk or paved driveway located on public property [
= Clearance under veranda, porch, deck, or balcony. See Figure 13, page 17. [For Canada *12" (305mm) minimum
M
N = Clearance above a roof shall extend a minimum of 24" (610mm) above the highest point when it passes through the roof
surface and any other obstruction within a horizontal distance of 18" (457mm).
*
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 outside vertical wall (1" required). A
1" minimum clearance all around the pipe must be maintained. Do not pack the open
air spaces with insulation or other materials. This could cause high temperatures and
may present a fire hazard.
16
C
B
B
Fixed
V
Closed
F
Operable
V
B
Air Supply Inlet
A
Figure 12 - Horizontal Vent Termination Location
H
B
B
Opera-
Fixed
V
ble
Closed
V
V
A
B
A
J
Area Where Terminals Not Permitted
Inside Corner Detail
G
V
A
I
M
V
A
A
K
**
7' (2133mm) minimum].
G
***
].
56D3049
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