24
This gas appliance must not be connected to a chimney serving any other appliance.
Location
Clearances
U.S.
Canada
A Above grade, veranda, porch, deck, balcony
12 in. (305 mm)
12 in. (305 mm)
B Operable window or door
9 in. (229 mm)
12 in. (305 mm)
C Permanently closed window*
12 in. (305 mm)**
12 in. (305 mm)**
D Ventilated soffit*
24 in. (610 mm)
24 in. (610 mm)
E Unventilated soffit*
12 in. (305 mm)
12 in. (305 mm)
F Outside corner*
12 in. (305 mm)
12 in. (305 mm)
G Inside corner*
6 in. (152 mm)
6 in. (152 mm)
H Meter/ Regulator
(*)
(***)
I Gas service regulator vent outlet
(*)
3 ft.
J Non-mechanical air supply inlet to building or the combustion air inlet to any other appliance
9 in. (229mm)
12 in (305mm)
K Mechanical air supply inlet
6 ft. (1.83 m)
(††) (†)
L Above paved side-walk or paved driveway located on public property ††*
(*)
7 ft. (2.13 m)
M Under veranda, porch, deck, or balcony. Must be fully opened on a minimum of two sides
12 in. (305 mm)
12 in. (305 mm)
N Between two horizontal terminations††**
12 in. (305 mm)
12 in. (305 mm)
O Between two vertical terminations
12 in. (305 mm)
12 in. (305 mm)
P Above furnace exhaust or inlet
12 in. (305 mm)
12 in. (305 mm)
* Clearance must be in accordance with local installation codes and the requirements of the gas supplier.
** Recommended to prevent condensation on window
***Not to be installed above a gas meter/regulator assembly within 3 ft. (914 mm) horizontally from the centerline of the regulator within a height of 15 ft. (4.57 m)
†† 3 ft. (914 mm) above if within 10 ft. (3.05 m) horizontally.
† Massachusetts: 10 ft. (3.05 m)
††*
NOTICE:
A vent cannot be located directly above a side-walk or paved driveway that is located between two single family dwellings and serves both dwellings.
††**Terminations may be the same height.
11.9
Termination Vent Cap Clearances
Figure 11.13, Vent Cap Locations
Denotes where installation not allowed
