Page 22
Table 3. Required Exhaust Vent Material.
VENTING
INSTALLATION STANDARDS
MATERIAL
UNITED STATES
CANADA
Stainless Steel
UL 1738
Venting must be ULC-S636 certified for use as
PVC, sch 40
ANSI/ASTM D1785
venting material. The venting material must be chosen
CPVC, sch 40
ANSI/ASTM F441
based upon the intended application of the boiler.
Polypropylene
UL1738 or ULC-S636
The flue temperature of the FT changes
dramatically with changes in operating water
temperature. Therefore, it is necessary to assess
the application of the boiler to determine the
required certified vent class. If the FT is installed
in an application where the ambient temperature
is elevated, and/or installed in a closet/alcove,
CPVC, polypropylene, or stainless steel material is
required. If the system temperatures are unknown
at the time of installation, stainless, polypropylene
or CPVC material is recommended.
The FT is a Category IV appliance and may be
installed with PVC, CPVC or polypropylene that
complies with
ULC
-S636, ANSI/ASTM D1785 F441
(see
Table 3)
or a stainless steel venting system that
complies with UL 1738 Standard and ULC S636.
WARNING
Failure to use the appropriate vent material,
installation techniques, glues/sealants could lead to
vent failure causing property damage, personal injury
or death.
WARNING
All venting must be installed according to this manual
and any other applicable local codes, including but
not limited to, ANSI Z224.1/NFPA 54, CAN/CSA
B149.1 and ULC-S636. Failure to follow this manual
and applicable codes may lead to property damage,
severe injury, or death.
WARNING
Use of cellular core PVC (ASTM F891), cellular core
CPVC, or Radel® (polyphenolsulfone) in non-metallic
venting systems is prohibited and covering non-
metallic vent pipe and fittings with thermal insulation is
prohibited.
NOTICE
DO NOT COMMON VENT FT UNITS. FT
units are never permitted to share a vent with
Category I appliances.
AVIS
NE PAS ÉVENT COMMUNE FT UNITÉS. FT
unités ne sont jamais autorisés à partager un
évent Catégorie I avec les appareils.
4.4
Venting (Exhaust)
INSTALLATIONS IN CANADA
require the use
of venting material certified to ULCS636. All Gas
vents connected to the FT, plastic, stainless steel
or otherwise must be certified to this ULC stand
-
ard. Appropriate selection of vent material is very
important for proper performance and safe opera
-
tion of the FT.
The flue temperature of the FT changes dramati
-
cally with changes in operating water temperature.
Therefore, it is necessary to assess the application
of the boiler to determine the required certified vent
class. If the FT is installed in an application where
the outlet water temperature exceeds 145°F, and/or
installed in a closet, class IIB or higher vent mate
-
rial is required. If the system temperatures are un
-
known at the time of installation, class IIB or higher
venting material is recommended.
IN CANADA
all venting used must meet the
following requirements:
1. ULC-S636 certified and marked
2. The first 3 feet of venting must be accessible
for visual inspection.
3. All components used in the vent system must
be from a certified manufacturer.
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