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† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and
serves both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
Direct exhaust vapors and condensate away from building materials to avoid degradation. The minimum distance from adjacent
public walkways, adjacent buildings, openable windows, and building openings shall not be less than those values specified in the
National Fuel Gas Code, ANSI Z223.1/NFPA 54, and/or the Natural Gas and Propane Installation Code, CSA B149.1.
5.4 Selecting Vent Pipe Materials
Venting requirements differ in the US and Canada.
Consult the following chart or the most recent
edition of ANSI Z223.1/NFPA 54 or CAN/CGA B149.1,
as well as all applicable local codes and regulations
when selecting vent pipe materials. Do not use
cellular core PVC (ASTM F891), cellular core CPVC, or
Radel® (polyphenolsulfone) for the exhaust vent.
WARNING
Carbon Monoxide Hazard
To prevent serious injury or death:
ONLY use approved venting materials.
●
NEVER mix different types of vent pipe
●
materials. The vent system may fail and harmful
flue products may leak into the living space.
The use of more than one type of pipe for the
vent piping will also void the warranty and
certification of the boiler.
Locale
Recommended Vent Materials
PVC/CPVC Schedule 40 or 80 (Solid
●
Core)
UL1738 approved PVC or CPVC
USA
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Approved Polypropylene (PP)
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Approved Stainless Steel (SS)
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Type BH Special Gas Vent Class IIA
●
(PVC)
Type BH Special Gas Vent Class IIB
●
Canada*
(CPVC)
Type BH Special Gas Vent Class IIC
●
(Polypropylene/Stainless Steel)
* For installation in Canada, field-supplied plastic vent
piping must comply with CAN/CGA B149.1 (latest edition)
and be certified to the Standard For Type BH Gas Venting
Systems, ULC-S636. Components of this listed system
must not be interchanged with other vent systems or
unlisted pipes or fittings. All plastic components and
specified primers and glues of the certified vent system
must be from a single system manufacturer and must not
be intermixed with another system manufacturer's parts.
The supplied vent connector and vent termination are
certified as part of the boiler.
The vent system shall be installed in accordance
with the boiler manufacturer and, if applicable, the
venting system manufacturer's instructions.
This product is set to use PVC as the default vent
pipe material. If you require that return water hotter
than 140°F (60°C) to circulate back to boiler, the
DIP switch must be configured (DIP SW2 (Set of
8 Switches) #8 to ON position). Otherwise, the
boiler will control and maintain the flue and DHW
temperature below 150°F (65°C) and 140°F (60°C)
respectively.
When you set PCB DIP SW2 (Set of 8
Note
Switches) #8 to On, ensure that CPVC,
polypropylene or stainless steel piping
is used for exhaust venting.
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CAUTION
This boiler has a built-in control to limit the
●
exhaust temperature to 149°F (65°C). As a
result, the boiler can be vented with Schedule
40 PVC.
In high temperature applications, the exhaust
●
temperature can exceed 149°F (65°C). In that
case, you must use Schedule 40/80 CPVC or
Approved Polypropylene/Stainless Steel in
the USA or Type BH Special Gas Vent Class IIB
(CPVC) or Class IIC (Polypropylene/SS) that
conforms to ULC-S636 in Canada.
When using 2 in. vent, if the exhaust
●
temperature exceeds 149°F (65°C), CPVC
pipe (field supplied) must be used for the first
3 feet of equivalent pipe length. For systems
using 3 in. vent, the first 5 in. of length must
be CPVC pipe.
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Venting for Combustion Air
61
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