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Twin Pipe PVC/CPVC Vent Installation Requirments:
All PVC/CPVC IPEX Concentric Vent Kit (CVK)
Assemblies are certi d to ULC S636. Where ULC S636
compliance is required, use only System 636 pipe,
fi
gs, and cement at the terminal connec on.
DO NOT use PVC/CPVC on Non-Condensing Units.
DO NOT operate unit unti venting is completely
installed and all solvents and glues have bonded.
All PVC/CPVC exhaust vent material used in
Canada must be S636 cer fi d.
For further details on listed PVC/CPVC venting
material (tabled below) refer to the installatio manual of
the PVC/CPVC manufacturer.
IMPORTANT CONSIDERATIONS FOR LOCATION:
Locate the vent outlet where fl e gases will not harm
surrounding plants and/or cooling equipment.
Avoid locati g vent where prevailing winds could
aff ct the performance of the water heater or cause
recirculatio of the flue gases.
DO NOT terminate the venti g over a public walkway
or over an area where condensate or vapor can
create a nuisance / hazard or where condensate can
be detrimental to the opera on of equipment such as
regulators or relief valves
Item
Vent or combustio air
intake pipe & Fittings
PVC pipe cement &
primer
Terminati n Vent
Screens
The listed vent, vent fitti s, termina on, cleaner, and glue are all cer
water heater vent system.
Failure to correctly install vent and combus on air intake pipes of the water heater to atmosphere as outlined
in this ven ng sec on will result in death from asphyxia on (from carbon monoxide), fire, or explosion. NEVER
operate the water heater without proper ven ng (vent and combusti n air intake). Always inspect the vent
terminal unit, combusti n air intake pipe, and the enti e vent system affixed to the water heater for proper
installa on at equipment commissioning and at least annually therea er.
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Vent and Air Piping Materials
Material
Thermoplas c Piping Materials
PVC schedule 40
PVC-DWV
CPVC schedule 40
PVC
CPVC
IPEX bird screens (purchase separately)
Polyethylene
KBP Series Manual
Water Heater fl e gases must be piped from the
appliance to the outside, Installer MUST adhere to the
instruc ons provided herein and the most
recent Water Heater Manual and all applicable codes.
Exhaust and combustio air must terminate through
the same sidewall or roof as the terminati ns must be
in the same pressure zone and face same direc on.
Vent pipe must terminate either through the sidewall
or through the roof, exhaust/vent terminati n and/or
intake air openings shall adhere to clearances as set
forth in the Direct Vent Terminati n Clearances
diagram.
Each Condensing Tankless Water Heater requires a
separate vent system.
For twin pipe installatio use only 3"or 4" PVC/CPVC.
Terminati ns must be installed 12" above grade or
anti ipated snow level.
Standard for Installa on in North America
United States
ANSI/ASTM D1785
ANSI/ASTM D2665
ANSI/ASTM F441
ANSI/ASTM D2564
ANSI/ASTM F493
3" Vent screen: IPEX part # 196051; 4" Vent screen: part #: 196052
(Screens are frictio fi ed inside terminati n fi
NOTE
ed as part of the condensing tankless
DANGER
Canada
Thermoplas c vent pipe must be
certi ed to ULC S636.
Intake pipe may be of any material listed
(left .
g bells.)
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