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W415-1407 / 11.20.14
12
EN
3.4 MINIMUM AIR TERMINAL LOCATION CLEARANCES
INSTALLATIONS
CANADA U.S.A.
A 12” (304.8mm) 12” (304.8mm) Clearance above grade, veranda porch, deck or balcony.
B 12” (304.8mm)
Δ
9” (228.6mm)
Δ
Clearance to windows or doors that open.
C 12” (304.8mm)* 12” (304.8mm)* Clearance to permanently closed windows.
D
18”
(457.2mm)**
18” (457.2mm)**
Vertical clearance to ventilated soffi ts located above the terminal within a horizontal distance
of 2’ (0.6m) from the centerline of the terminal.
E
12”
(304.8mm)**
12” (304.8mm)** Clearance to unventilated soffi 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 (chim-
ney, etc.).
2” (50.8mm)*** 2” (50.8mm)***
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 centerline 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” (304.8mm) 9” (228.6mm)
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”
(304.8mm)††
12”
(304.8mm)****
Clearance under a veranda, porch, deck or balcony.
N 16” (406.4mm) 16” (406.4mm) Clearance above the roof.
O 2’ (0.61m)†* 2’ (0.61m)†* 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.
Δ
The terminal shall not be located less than 6 feet (1.8m) 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 maximize the distance to vinyl clad soffi ts.
*** The periscope requires a minimum 18” (457.2mm) clearance from an inside corner.
**** This is a recommended distance. For additional requirements check local codes.
† 3 feet (0.91m) above if within 10 feet (3.1m) 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.
12.3C
R
Q
M
G
P
COVERED BALCONY APPLICATIONS
Q
MIN
R
MAX
MAX
R
= 3 feet
(0.9m)
= 2 x
IHHW
(4.6m)
Q
ACTUAL
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