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PART 7 – VENTING, COMBUSTION AIR AND CONDENSATE
REMOVAL
The heater must be vented as detailed in this Venting Section. Ensure exhaust and intake piping
complies with these instructions regarding vent system.
Inspect finished combustion air intake and exhaust piping thoroughly to ensure all joints are well secured,
airtight, and comply with all applicable code requirements, as well as with the instructions provided in this
manual.
Failure to provide a properly installed vent system will cause severe personal injury or death.
A. GENERAL
This vent system will operate with a positive pressure in the pipe. Do not connect vent connectors serving
appliances vented by natural draft into any portion of mechanical draft systems operating under positive
pressure.
Follow the venting instructions below carefully. Failure to do so may result in substantial property
damage, severe personal injury, or death.
1. Install the water heater venting system in accordance with these instructions and with the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, CAN/CGA B149, and/or applicable provisions of local building codes.
2. This water heater is a direct vent appliance and is listed as a Category IV appliance with Underwriters
Laboratories, Inc. VENT AND INTAKE AIR VENT.
B. APPROVED MATERIALS FOR EXHAUST AND INTAKE AIR VENTS
Item
Vent or air pipe and
fittings
Pipe cement/primer
Table 3
Do not use Foam Core Pipe in any portion of the exhaust piping from this heater. Use of Foam Core Pipe
may result in substantial property damage, severe personal injury, or death.
APPROVED VENTING MATERIAL
Material
PVC schedule 40/80
PVC-DWV
CPVC schedule 40/80
PVC
CPVC
Standards for Installation in:
United States
ANSI/ASTM D1785
ANSI/ASTM D2665
ANSI/ASTM F441
ANSI/ASTM D2564
ANSI/ASTM F493
26
Canada
CPVC and PVC venting
must be ULC-S636
Certified. IPEX is an
approved manufacturer in
Canada, supplying vent
material listed to ULC-
S636.
IPEX System 636
Cements & Primers
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