13
W415-1301 / A / 05.23.14
EN
3.4 MINIMUM AIR TERMINAL LOCATION CLEARANCES
INSTALLATIONS
CANADA
U.S.A.
A
12” (305mm)
12” (305mm)
Clearance above grade, veranda porch, deck or balcony.
B
12” (305mm)
Δ
9”
(229mm)
Δ
Clearance to windows or doors that open.
C
12” (305mm)*
12” (305mm) * Clearance to permanently closed windows.
D
18”
(457mm)**
18” (457mm)**
Vertical clearance to ventilated sof
fi
ts located above the terminal within a horizontal distance of 2’
(0.6m) from the center line of the terminal.
E
12” (305mm)** 12” (305mm)** Clearance to unventilated sof
fi
t.
F
0” (0mm)
0” (0mm)
Clearance to an outside corner wall.
G
0” (0mm)***
0”
(0mm)***
Clearance to an inside
non
-combustible corner wall or protruding
non
-combustible obstructions (chimney,
etc.).
2” (51mm)***
2”
(51mm)***
Clearance to an inside combustible corner wall or protruding combustible obstructions (vent chase,
etc.).
H
3’(0.9m)
3’ (0.9m)****
Clearance to each side of the center line extended above the meter / regulator assembly to a
maximum vertical distance of 15’ (4.6m).
I
3’ (0.9m)
3’ (0.9m)****
Clearance to a service regulator vent outlet.
J
12” (305mm)
9” (229mm)
Clearance to a non-mechanical air supply inlet to the building or a combustion air inlet to any other
appliance.
K
6’ (1.8m)
3’ (0.9m) †
Clearance to a mechanical air supply inlet.
L
7’ (2.1m) ‡
7’ (2.1m) ****
Clearance above a paved sidewalk or paved driveway located on public property.
M
12”
(305mm)††
12”
(305mm)****
Clearance under a veranda, porch or deck.
N
16” (406mm)
16” (406mm)
Clearance above the roof.
O
2’ (0.6m)†*
2’ (0.6m) †*
Clearance from an adjacent wall including neighbouring buildings.
P
8’ (2.4m)
8’(2.4m)
Roof must be
non
-combustible without openings.
Q
3’ (0.9m)
3’ (0.9m)
See chart for wider wall dimensions.
R
6’ (1.8m)
6’ (1.8m)
See chart for deeper wall dimensions. The terminal shall not be installed on any wall that has an
opening between the terminal and the open side of the structure.
S
12” (305mm)
12” (305mm)
Clearance under a covered balcony
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 where it may cause hazardous frost or ice accumulations on adjacent property surfaces.
††
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.
††*
Permitted only if the balcony is fully open on a minimum of one side.
12.1D
NOTE: Clearances are in accordance with local installation codes and the requirements of the gas supplier.
COVERED BALCONY APPLICATIONS
††*
Q
MIN
R
MAX
MAX
R
= 3 feet
(0.9m)
= 2 x
IHHW
(4.6m)
Q
ACTUAL
R
Q
S
G
P
