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

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)

Proper 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 Standard	Type of the Pipe	max Allowable Temp	Marking on pipe surface
F891	Cellular Core	158o	ASTM F891
D2665	DWV Pipe		ASTM D2665
D1785	SCH 40, 80, 120		ASTM D1785
D2241	SDR Series		ASTM D2241

 

CPVC Pipe

ASTM Standard	Type of the Pipe	max Allowable Temp	Marking on pipe surface
D2846	CPVC 41	212o	ASTM D2846
F441	SCH 40, 80		ASTM  F441
F442	SDR Series		ASTM F442

 

ABS Pipe

ASTM Standard	Type of the Pipe	max Allowable Temp	Marking on pipe surface
D2661	SCH 40 DWV	180o	ASTM D2661
F628	SCH 40 DWV Cellular Core		ASTM  F628441