DuraVent PolyPro® polypropylene vent pipe is designed for use with ANSI Category II and IV gas-burning appliances, including high efficiency water heaters, condensing boilers, and warm air furnaces. PolyPro is ETL listed to the ULC S636 standard in Canada as a Class IIA, IIB and IIC vent system suitable for exhaust temperatures up to 230F and a maximum positive pressure of 15 in-w.c.

Sources say PolyPro is superior in performance and easier to install than PVC and CPVC pipe, which were designed for drainage and irrigation, not venting. PolyPro has successfully vented appliances in Europe for over 20 years.

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