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6. Consideration for the following should be used when determining an appropriate location
for termination of combustion air and vent piping.
Comply with all clearances required as stated in paragraph 7.
Termination should be positioned where vent vapors will not damage plants/shrubs or air
conditioning equipment.
Termination should be positioned so that it will not be effected by wind eddy, air born
leaves, snow, or recirculated flue gases.
Termination should be positioned where it will not be subjected to potential damage by
foreign objects, such as stones, balls, etc..
Termination should be positioned where vent vapors are not objectionable.
Put vent on a wall away from the prevailing winter wind. Locate or guard the vent to
prevent accidental contact with people or pets.
Terminate the vent above normal snowline. Avoid locations where snow may drift and
block the vent. Ice or snow may cause the boiler to shut down if the vent becomes
obstructed.
Under certain conditions, flue gas will condense, forming moisture, and may be corrosive.
In such cases, steps should be taken to prevent building materials at the vent from being
damaged by exhaust of flue gas.
7. The venting system shall terminate at least 3 feet above any forced air inlet (except the
boilers combustion air inlet) within 10 feet. The venting system shall terminate at least 12
inches from any air opening into any building. The bottom of the vent shall be located at
least 12 inches above grade. Termination of the vent shall be not less than 7 feet above an
adjacent public walkway. The vent terminal shall not be installed closer than 3 feet from the
inside corner of an L shaped structure. Termination of the vent should be kept at least 3
feet away from vegetation. The venting system shall terminate at least 4 feet horizontally
from, and in no case above or below, unless a 4 foot horizontal distance is maintained, from
electric meters, gas meters, regulators, and relief equipment.
FIGURE 9 ROOF VENT/INTAKE TERMINATIONS