DuraVent 3" PolyPro Firestop Spacer for Concentric Pipe

3" PolyPro Firestop Spacer for Concentric Pipe. Use when penetrating floor levels. Two piece design for easier installation. PolyPro. is engineered for use with category II and IV condensing gas/oil appliances and heating equipment, including tankless water heaters, high efficiency water heaters, condensing boilers and warm air furnaces. Application PolyPro is a polypropylene vent pipe for use with ANSI Category II and IV gas-burning appliances, including high efficiency water heaters, condensing boilers and warm air furnaces. PolyPro is listed by Intertek to the ULC SC636 standard in Canada as a Class IIA, IIB and IIC vent system suitable for exhaust temperatures up to 230F / 110C, 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 optional Viton Gaskets. Clearances 0" clearance to combustible for exhaust temperatures up to 194F / 90C, and 0" clearance for vertical installations ...