13
W415-1232 / B / 05.15.14
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 soffi 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 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 (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 soffi 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
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