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9. If possible, slope horizontal combustion air
pipe minimum 1/4 in/ft (21 mm/m) downward
towards terminal. If not, slope towards the
appliance.
10. It is recommended that a Carbon Monoxide
detector be installed and interlocked to the
appliance. Consult your local jurisdiction for
additional requirements.
B. Venting Design Requirements
At the discretion of the installing contractor, the
venting system can be designed by consulting
with approved venting engineers or by using the
equivalent length method in this manual.
1. Engineered Venting Method
(Recommended Method) Using the operating
characteristics and required conditions, an
individual or common venting system can
be designed to ensure the reliability of the
appliance(s).
a. Flue gas temperatures and flow rates can be
found in Table 8.
b. The pressure at the flue outlet of the appliance
at any given firing rate must be within the
range of negative 0.25" W.C. to positive 0.5"
W.C.
c. The pressure at the intake of the appliance at
any given firing rate must be within the range
of 0.0" WC to positive 0.1" WC.
d. Manifolded venting without backflow
prevention can allow flue gas from one
appliance to interact with the other appliances
in the system. Common venting systems must
be designed with backflow protection.
2. Equivalent length method: Do not exceed
maximum vent/combustion air lengths listed in
Table 6. Equivalent lengths of fittings are given
in Table 7.
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Thermal Solutions, 1175 Manheim Pike, Lancaster, PA 17601 Website: www.thermalsolutions.com
Phone: 717-239-7642 Fax: 877-501-5212 Email: sales@thermalsolutions.com
C. Field Installation
1. A factory installed cast aluminum or steel ring
provides a means for air intake connection.
2. A factory installed vent connector provides a
means for connection to stainless steel venting.
3. Vent and combustion air intake pipe must be
supported at intervals no less than (5) feet
apart. The completed vent system must be
rigid and able to withstand impacts without
collapse, to allow uniform flow of combustion
air and flue gas.
4. Plan venting system to avoid possible contact
with plumbing or electrical wires. Start at the
vent connector and work towards the vent
termination.
5. Design the air intake system to allow 3/8"
(9.5mm) of thermal expansion per 10 ft. (3m)
of CPVC/PVC pipe. Runs of 20 ft. (6.1m) or
longer that are restrained at both ends must
have an offset.
a. PVC combustion air pipe joints must be
cleaned with primer and glued with cement.
Follow all manufacturer instructions and
drawings when preparing pipe ends for
joining and using the primer and the cement.
6. Size and cut wall opening such that a minimal
clearance is obtained and to allow easy
insertion of vent pipe.
WARNING
WARNING
Failure to follow these instructions could cause
products of combustion to enter the building,
resulting in severe property damage, personal injury,
or death.
Use CPVC vent components within any interior space
where air cannot circulate freely, including through
vertical or horizontal chase ways, inside a stud wall,
in closets, and through wall penetrations.
The use of cellular core PVC (ASTM F891), cellular
core CPVC or Radel (polyphenolsulfone) is prohibited.
All condensate that forms in the vent must be able
to drain back to the heat exchanger.
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