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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
4.3 Venting (Exhaust)
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.
__________________________________________
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
standard. Appropriate selection of vent material is
very important for proper performance and safe
operation of the FT.
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 outlet water temperature
exceeds 145°F, and/or installed in a closet, class
IIB or higher vent material is required. If the
system temperatures are unknown 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.
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.
SECTION 4. Installation (continued)
