UTICA BOILERS UB90-50 Installation Manual page 25

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 ef-
fected 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 loca-
tions where snow may drift and block the vent. Ice or
Figure 9 - Roof Vent / Intake terminations
COMBUSTION AIR AND VENT PIPE
7.
25
snow may cause the boiler to shut down if the vent be-
comes obstructed.
• Under certain conditions, flue gas will condense, form-
ing 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.
The venting system shall terminate at least 3 feet above any
forced air inlet (except the boiler's 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 sys-
tem 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.