3 High Efficiency Furnace Plastic Vent Pipe Types (PVC, CPVC & ABS)

There are 3 plastic types of pipes certified by the American Gas Association for use in high efficiency, condensing, category 4 furnaces: PVC, CPVC, and ABS

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Plastic vent pipe types listed below have been certified by the American Gas Association for use in furnaces classified as Category 4.

These particular types of furnaces use positive pressure vent systems (exhaust gas temperature less than 1400F above the dew point temperature) and are always equipped with an induced draft motor that removes exhaust gases from the appliance and discharges them to the exterior.

The dewpoint temperature is the temperature at which the air can now longer hold all of its water vapor, and some of the water vapor must condense into liquid water. (definition by weatherquestions.com)

High efficiency furnace PVC vent pipe types and specificationsProper installation of the vent system is essential for the condensing furnace (that’s another name for category 4 type furnace) to achieve maximum efficiency and to drain condensate efficiently from the system.

Make sure that your  installation complies with National, State and Local codes. Some of the furnace installation guides may be available online or obtained directly from the manufacturer.

There are 3 plastic types of pipes certified by the American Gas Association for use in high efficiency, condensing, category 4 furnaces: PVC, CPVC, and ABS

PVC  pipe

ASTM StandardType of the Pipemax Allowable TempMarking on pipe surface
F891Cellular Core158oASTM F891
D2665DWV PipeASTM D2665
D1785SCH 40, 80, 120ASTM D1785
D2241SDR SeriesASTM D2241

 

CPVC Pipe

ASTM StandardType of the Pipemax Allowable TempMarking on pipe surface
D2846CPVC 41212oASTM D2846
F441SCH 40, 80ASTM  F441
F442SDR SeriesASTM F442

 

ABS Pipe

ASTM StandardType of the Pipemax Allowable TempMarking on pipe surface
D2661SCH 40 DWV180oASTM D2661
F628SCH 40 DWV Cellular CoreASTM  F628441

3 Comments
  1. stephen dee says

    I’d like to buy 3″ CPVC for a gas vent, but I can’t find any suppliers. I’ve seen this stuff in the field, but where does one buy it?

  2. Chris says

    My Rinnai Tankless water heater usings a pipe inside a pipe for venting and fresh air intake. Why don’t any high efficiency furnaces do that?

    1. Dariusz Rudnicki says

      Hi Chris,
      High efficiency furnaces do that as well (http://www.kvmtools.com/products/Vent-Termination-Kit-%7BDAYTON-6MC43%7D.html), but in most cases it’s only the final section of the 2 pipe system, at wall or roof penetration. Maybe because of the double wall PVC vent pipe cost… It’s significantly cheaper to run two single pipes and I’m not even sure if there are any manufacturers making 10′ long sections.

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