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W415-0788 / A / 09.22.09
3.4 VENT TERMINAL CLEARANCES
INSTALLATIONS
CANADA U.S.A.
A 12” 12” Clearance above grade, veranda porch, deck or balcony.
B 12” 9” Clearance to windows or doors that open.
C 12” * 12” * Clearance to permanently closed windows.
D 18” ** 18” **
Vertical clearance to ventilated soffi ts located above the terminal within a horizontal distance of 2’ from
the centerline of the terminal.
E 12” ** 12” ** Clearance to unventilated soffi 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.
* 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 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.
12.1
NOTE: Clearances are in accordance with local installation codes and the requirements of the gas supplier.
FIGURE 3.4