PolyPro Flex through B Vent as a Chase: Retrofit venting for new, high-efficiency appliances. When replacing a mid-efficiency appliance with a new condensing 90+ appliance, you can use the existing B vent (any brand) as a chase for the new appliance with PolyPro. The perfect solution for utilizing the B Vent already in place, use the convenient pull cone to insert double-wall PolyPro Flex through the B Vent pipe and terminate in either a two pipe or single pipe system. At the other end is the unique B Vent/Polypro Support Cap, allowing for the connection of flex to rigid PolyPro lengths and elbows to finish the installation.
Use to line masonry chimneys that vent condensing appliances|Double wall construction|Can be cut to precise length in the field|5 in Dia flex comes in rolls of 98 ft only|Flex is double-wall polypropylene
DuraVent PolyPro Flex Vent Pipe, Flexible, 4 in Dia, 35 ft Length, Polypropylene