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4. Combustion air and vent piping to be pitched back to
boiler at minimum ¼" per foot from intake and vent
terminals so that all moisture in combustion air and
vent piping drains to boiler. Pipes must be pitched
continuously with no sags or low spots where mois-
ture can accumulate and block the flow of air or flue
gas. Combustion air and vent pipes must be airtight
and watertight.
5. 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 6 (below)
• Termination should be positioned where vent
vapors will not damage plants/shrubs, air con-
ditioning equipment, or siding on the house.
• 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 for-
eign 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 pre-
vent 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 ob-
structed.
• Under certain conditions, flue gas will con-
dense, forming moisture, and may be corro-
sive. In such cases, steps should be taken
to prevent building materials at the vent from
being damaged by exhaust of flue gas.
6. The venting system shall terminate at least 3 feet
above any forced air inlet (except the boiler's com-
bustion air inlet) within 10 feet. The venting sys-
tem 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 termi-
nal 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
Viii. coMBUstioN air aND VeNt PiPe
vegetation. The venting system shall terminate at
least 4 feet horizontally from, and in no case above
or below electric meters, gas meters, regulators,
and relief equipment.
If multiple terminations are used, there must be a
minimum of 12 inches between the exhaust of one
termination and the air intake of the next termina-
tion. See Figures #1 – #3 in Section E5 for illustra-
tions.
notE: All field installed vent pipe must be 3".
InstallatIon
1. Attach combustion air intake piping to supplied
Fernco 2" coupling on CVI gas valve. Attach vent
piping to furnished 2" CPVC vent tee on draft in-
ducer outlet.
notE: All pipe joints are to be water tight.
2. Working from the boiler to the outside, cut pipe to
required length(s).
3. Deburr inside and outside of pipe. Remove all chips
and shavings.
4. Chamfer outside edge of pipe for better distribution
of primer and cement.
5. Clean and dry all surfaces to be joined.
6. Check dry fit of pipe and mark insertion depth on
pipe.
notE: It is recommended that all pipes be cut,
prepared, and pre-assembled before permanently
cementing any joint.
7. After pipes have been cut and pre-assembled, ap-
ply cement primer to pipe fitting socket and end of
pipe to insertion mark. Quickly apply approved ce-
ment to end of pipe and fitting socket (over primer).
Apply cement in light, uniform coat on the inside of
socket to prevent buildup of excess cement. Apply
second coat.
8. While cement is still wet, insert pipe into socket with
a ¼ turn twist. Be sure pipe is fully inserted into fit-
ting socket.
9. Wipe excess cement from joint. A continuous bead
of cement will be visible around perimeter of a
properly made joint.
14
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