Discover why Duravent's PolyPro venting system is superior to PVC/CPVC. PolyPro pipes are used for venting water heaters, condensing boilers, and warm air furnaces. PolyPro is an environmentally safe and engineered alternative, for condensing gas appliances. Engineered for venting, it is 100% recyclable and contains no toxic or carcinogenic materials, chlorides, or heavy metals. PolyPro does not release hazardous gases during combustion and has been used safely throughout Europe for over 20 years. Polypropylene has a higher operating temperature limit of 230°F/110°C (PVC is 149°F/65°C max and CPVC is 194°F/90°C). PolyPro is engineered with a corrosion-free, condensation management system.