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Asphyxiation Hazard. Failure to vent this boiler in accordance with these instructions could cause
products of combustion to enter the building resulting in severe property damage, personal injury
or death.
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Do not interchange vent systems or materials unless otherwise specified.
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The use of thermal insulation covering vent pipe and fittings is prohibited.
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Do not use a barometric damper, draft hood or vent damper with this boiler.
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When using the CPVC/PVC vent option, the use of CPVC is required when venting in vertical or
horizontal chase ways.
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Any CPVC vent materials supplied with this boiler do not comply with B149.1.S1-07 and are not
approved for use in Canadian jurisdictions that require vent systems be listed to ULC S636-2008. In
these jurisdictions, vent this boiler using a listed ULC S636 Class IIB venting system.
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Do not locate vent termination where exposed to prevailing winds. Moisture and ice may form on
surface around vent termination. To prevent deterioration, surface must be in good repair (sealed,
painted, etc.).
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Do not locate air intake termination where chlorines, chlorofluorocarbons (CFC's), petroleum
distillates, detergents, volatile vapors or other chemicals are present. Severe boiler corrosion and
failure will result.
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The use of cellular core PVC (ASTM F891), cellular core CPVC or Radel (polyphenolsulfone) is
prohibited.
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Do not locate vent termination under a deck.
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Do not reduce specified diameters of vent and combustion air piping.
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Do not allow low spots in the vent where condensate may pool.
This manual covers installation of vent options employing CPVC/PVC vent systems only. Other vent
options exist for this boiler which use listed polypropylene (PP) vent systems offered by several
manufacturers. Supplemental instructions for the design and installation of these vent systems with
this boiler are available on our web site.
There are three basic ways to vent this boiler:
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Horizontal ("Side Wall") Twin Pipe Venting (Figure 7.0a) - Vent system exits the building through an outside wall.
Combustion air and flue gas are routed between the boiler and the terminal(s) using separate pipes. A summary of
Horizontal Twin Pipe venting options is shown in Table 7.5.
Vertical Twin Pipe Venting (Figure 7.0b) - Vent system exits the building through a roof. Combustion air and flue gas
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are routed between the boiler and the terminal(s) using separate pipes. A summary of Vertical Twin Pipe venting options
is shown in Table 7.11
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Split Venting (Figure 7.0c) - Exhaust system exits the building through a roof, and combustion air is drawn from a
terminal mounted on the side wall. A summary of split venting options is shown in Table 7.15
VII Venting
WARNING
NOTICE
A. General Vent System Design
11
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