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6 - COMBUSTION AIR AND VENT PIPING
FIGURE 6-27 Flue Termination Location
Vent Termination Minimum Clearances
USA
CANADA
A
Clearance above grade, veranda, porch, deck, or balcony
12" (305mm)
12" (305mm)
B
Clearance to window or door that may be opened
12" (305mm)
3 ft. (0.9m)
C
Clearance to permanently closed window
*12" (305mm)
*12" (305mm)
D
Vertical Clearance to ventilated soffit located above the terminal within a horizontal distance of 2 feet
(610 mm) from the center line of the terminal
18" (457mm)
18" (457mm)
E
Clearance to unventilated soffit
18" (457mm)
18" (457mm)
F
Clearance to outside corner
9" (229mm)
9" (229mm)
G
Clearance to inside corner
6" (152mm)
6" (152mm)
H
Clearance to each side of center line extended above meter/ regulator assembly
3 ft. (0.9m) within a
height of 15 ft. (4.5m)
above the meter/
regulator assembly
3 ft. (0.9m) within a
height of 15 ft. (4.5m)
above the meter/
regulator assembly
I
Clearance to service regulator vent outlet
3 ft. (0.9m)
3 ft. (0.9m)
J
Clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other
appliance
12" (305mm)
3 ft (0.9m)
K
Clearance to mechanical air supply inlet
*3 ft. (0.9m)
6 ft. (1.8m)
L
Clearance above paved sidewalk or paved driveway located on public property
*7 ft. (2.1m)
7 ft. (2.1m)
1
M
Clearance under veranda, porch, deck or balcony
*12” (305mm)
2
12” (305mm)
2
*
For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearance will be in accordance with local installation codes and
requirements of gas supplier and these installation instructions.
(
1
)
Vent shall not terminate directly above sidewalk or paved driveway located between two single family dwellings and serves both dwellings.
(
2
)
Permitted only if veranda, porch, deck or balcony is fully open on a minimum of one side beneath the floor.
Note
Local Codes or Regulations may require different clearances. Flue termination must be exposed to external air and
position must allow free passage of air across it at all times. In certain weather conditions termination may emit a
plume of steam. Avoid positioning termination where this may cause nuisance.
P/N 240011664, Rev. E [09/15/2017]