20
LP-542 REV. 7.16.15
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 6 – Vent Termination Detail
Clearance above grade, veranda, porch, deck, or balcony
Clearance to window or door that may be opened
Clearance to permanently closed window
Vertical clearance to ventilated soffit located above the
terminal within a horizontal distance of 2 feet from the center
line of the terminal
Clearance to unventilated soffit
Clearance to outside corner
Clearance to inside corner
Clearance to each side of center line extended above meter
/ regulator assembly
3 feet with a height 15 feet
above meter / regulator
assembly
Clearance to service regulator vent outlet
Clearance to non-mechanical air supply inlet to building or
the combustion air inlet to any other boiler
Clearance to a mechanical air supply inlet
3 feet above if within 10 feet
horizontally
Clearance above paved sidewalk or driveway located
Clearance under veranda, porch, deck, or balcony
Table 8 – 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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