20
WHL-015 REV. 5.20.16
Vent terminals must be at least 1 foot from any door, window, or gravity inlet into the building.
Maintain the correct clearance and orientation between the exhaust vent and intake pipe terminals.
The exhaust vent and air intake terminals must be at the same height and their center lines must be spaced apart 1 foot
minimum.
The bottom of the exhaust vent and intake pipe terminals must be at least 1 foot above the normal snow accumulation level. In
no case should these terminals be installed less than 1 foot above normal snow accumulation level.
Do not install the exhaust vent terminals directly above windows or doors.
Intake pipe terminal must not terminate in areas that might contain combustion air contaminates, such as near swimming
pools.
For sidewall venting, the minimum horizontal distance between adjacent exhaust vent terminations is 1 foot. It is
recommended this distance be greater than 1 foot to better avoid frost damage to building surfaces.
For roof venting, minimum horizontal distance between any adjacent exhaust vent termination is 1 foot.
If the exhaust vent is to be terminated in a walled off area (such as a roof with a parapet wall), ensure the exhaust vent
terminates a minimum of 10' from nearest wall and extends level with or above the top of the wall. This will ensure flue gas
does not get trapped and possibly recirculated into the intake air pipe, which could contaminate the combustion air.
Figure 7
– Vent Termination Detail
DESCRIPTION
US
CANADA
A
Clearance above grade, veranda, porch, deck, or balcony
1 foot
1 foot
B
Clearance to window or door that may be opened
1 foot
3 feet
C
Clearance to permanently closed window
*
*
D
Vertical clearance to ventilated soffit located above the terminal
within a horizontal distance of 2 feet from the center line of the
terminal
*
*
E
Clearance to unventilated soffit
*
*
F
Clearance to outside corner
*
*
G
Clearance to inside corner
*
*
H
Clearance to each side of center line extended above meter /
regulator assembly
*
3 feet with a height 15 feet
above meter / regulator assembly
I
Clearance to service regulator vent outlet
*
3 feet
J
Clearance to non-mechanical air supply inlet to building or the
combustion air inlet to any other appliance
1 foot
3 feet
K
Clearance to a mechanical air supply inlet
3 feet above if within
10 feet horizontally
6 feet
L
Clearance above paved sidewalk or driveway located
*
7 feet
M
Clearance under veranda, porch, deck, or balcony
*
1 foot
Table 10
– Vent Termination Clearances - *NOTE: For clearances not specified in ANSI Z223.1/NFPA 54 or CAN/CSA-B 149.1,
please use clearances in accordance with local installation codes and the requirements of the gas supplier.
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