DuraVent PolyPro Flex Length: a roll of liner for a masonry chimney
The DuraVent PolyPro Flex Length is a flexible liner for a masonry chimney serving a condensing appliance. Its double wall liner comes in a roll and is cut to the length the chimney needs. PolyPro is DuraVent’s polypropylene vent pipe for high efficiency condensing gas boilers, furnaces, and water heaters. Choose a diameter, then a length. The 2 inch and 3 inch sizes come in 25, 35, or 50 foot lengths. The 4 inch size comes in 25 or 35 foot lengths on this page. The 5 inch size comes only in a 98 foot roll.
Exhaust liner must stay inside a chimney or chase, an enclosed passage, within 45 degrees of vertical and never horizontal. Only flex carrying air for combustion can run outside an enclosure or horizontally. Both ends need a flex gasket in the first complete groove beside the cut. A flex fitting closes around each end with two locking tabs. Gaskets take only soapy water, never petroleum grease. Need the accompanying parts? See the DuraVent PolyPro Flex Chimney Lining Kit. The DuraVent PolyPro Flex Length ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.
Details
SKU: 2PPS-FLEX25 | 2PPS-FLEX35 | 2PPS-FLEX50 | 3PPS-FLEX25 | 3PPS-FLEX35 | 3PPS-FLEX50 | 4PPS-FLEX25 | 4PPS-FLEX35 | 4PPS-FLEX50 | 4PPS-FLEX | 5PPS-FLEX
Applications
PolyPro is a polypropylene vent pipe for use with ANSI Category II and IV gas-burning appliances, including highefficiency water heaters, condensing boilers and warm air furnaces. Poly Pro is listed by Intertek to the ULC S636 standard in Canada as a Class IIA, IIB and IIC vent system suitable for exhaust temperatures up to 230°F / 110°C, and a maximum positive pressure of 15 in-w.c.
Materials and Construction
Rigid pipe constructed of 2.2mm (minimum) thick polypropylene. Flex is double-wall polypropylene. EPDM or Viton gaskets.
Clearances
General: 0″ clearance to combustibles for exhaust temperatures up to 194°F / 90°C.
Vertical Installations: 0″ clearance for vertical installations up to exhaust temperatures of 230°F / 110°C.
Horizontal Installations: ¼” / 6mm clearance to combustibles for horizontal installations at exhaust temperatures up to 230°F / 110°C.
Concentric vent system components, including Horizontal and Vertical Terminations: 0″ clearance to combustibles for exhaust temperatures up to 230°F / 110°C.
Diameters
2” (60mm) | 3” (80mm) | 4” (100mm) | 5” (130mm)
Listings
Listed with the appliance in the USA, check with appliance manufacturer. Intertek / ETL listed to ULC-S636 Listed as a Class IIA, IIB, and IIC vent system.
Previously the CSA certification trademark was shown in error in conjunction with the PolyPro product – references have been removed.
Videos
Newly Designed PolyPro® Locking Clamps Video
PolyPro® Double-Wall Video
Why Polypropylene? DuraVent’s PolyPro® Venting System Video