LAARS Heating Systems
Page 16
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 water heater.
Polypropylene
UL1738 or ULC-S636
The flue temperature of the Mascot ST changes
dramatically with changes in operating water
temperature. Therefore, it is necessary to
assess the application of the water heater to
determine the required certified vent class. If the
Mascot ST 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 Mascot ST 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.
INSTALLATIONS IN CANADA
require the use
of venting material certified to ULCS636. All
Gas vents connected to the Mascot ST, 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 Mascot ST.
The flue temperature of the Mascot ST changes
dramatically with changes in operating water
temperature. Therefore, it is necessary to assess
the application of the water heater to determine
the required certified vent class. If the Mascot ST
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 MASCOT ST UNITS.
Mascot ST units are never permitted to share a
vent with Category I appliances.
AVIS
NE PAS ÉVENT COMMUNE MASCOTTE ST
UNITÉS. Mascotte ST unités ne sont jamais
autorisés à partager un évent Catégorie I avec les
appareils.
WARNING
Use of cellular core PVC (ASTM F891), cellular core
CPVC, or Radel® (polyphenolsulfone) in venting systems
shall be prohibited.
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, CSA B149.1, CSAB149.2 and
ULC-S636. Failure to follow this manual and applicable
codes may lead to property damage, severe injury, or death.
NOTE: For Cascading Installations, please refer
to document 1351 ‘Cascading the Mascot ST’,
available online.
4.4
Venting (Exhaust)
