12
W415-0811 / A / 04.28.10
3.4 VENT TERMINAL CLEARANCES
INSTALLATIONS
CANADA
U.S.A.
A
12”
12”
Clearance above grade, veranda porch, deck or balcony.
B
12”
Δ
9”
Δ
Clearance to windows or doors that open.
C
12” *
12” *
Clearance to permanently closed windows.
D
18” **
18” **
Vertical clearance to ventilated sof
fi
ts located above the terminal within a horizontal distance of 2’ from
the centerline of the terminal.
E
12” **
12” **
Clearance to unventilated sof
fi
t.
F
0”
0”
Clearance to an outside corner wall.
G
0” ***
0” ***
Clearance to an inside
non
-combustible corner wall or protruding
non
-combustible obstructions (chimney, etc.).
2” ***
2” ***
Clearance to an inside combustible corner wall or protruding combustible obstructions (vent chase, etc.).
H
3’
3’ ****
Clearance to each side of the centerline extended above the meter / regulator assembly to a maximum
vertical distance of 15’.
I
3’
3’ ****
Clearance to a service regulator vent outlet.
J
12”
9”
Clearance to a non-mechanical air supply inlet to the building or a combustion air inlet to any other appliance.
K
6’
3’ †
Clearance to a mechanical air supply inlet.
L
7’ ‡
7’ ****
Clearance above a paved sidewalk or paved driveway located on public property.
M
12” ††
12” ****
Clearance under a veranda, porch, deck or balcony.
N
16”
16”
Clearance above the roof.
O
2’ †*
2’ †*
Clearance from an adjacent wall including neighbouring buildings.
P
8’
8’
Roof must be
non
-combustible without openings.
Q
3’
3’
See chart for wider wall dimensions.
R
6’
6’
See chart for deeper wall dimensions. The terminal shall not be installed on any wall that has an open-
ing between the terminal and the open side of the structure.
Δ
The terminal shall not be located less than 6 feet under a window that opens on a horizontal plane in a structure with three walls and a roof.
*
Recommended to prevent condensation on windows and thermal breakage
**
it is recommended to use a heat shield and to maximize the distance to vinyl clad sof
fi
ts.
***
The periscope requires a minimum 18 inches clearance from an inside corner.
****
This is a recommended distance. For additional requirements check local codes.
†
3 feet above if within 10 feet horizontally.
‡
A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
††
Permitted only if the veranda, porch, or deck is fully open on a minimum of two sides beneath the
fl
oor.
†*
Recommended to prevent recirculation of exhaust products. For additional requirements check local codes.
12.1A
NOTE: Clearances are in accordance with local installation codes and the requirements of the gas supplier.
R
Q
M
G
P
COVERED BALCONY APPLICATIONS
Q
MIN
R
MAX
MAX
R
= 3 feet
= 2 x
feet
Q
ACTUAL
