DuraVent FasNSeal Flex 9" x 35' Stainless Steel Custom Flex Length h7.375 After years of testing

After years of testing

12” pipe adds 3”-10” of length when used with rigid sections of pipe

Consists of a 4 ft

500 BTU’s

DuraVent FasNSeal Flex 9" x 35' Stainless Steel Custom Flex Length h7.375 After years of testingMade from super ferritic stainless steel. Corrosion resistant. Manufactured with a sure seal locking seam for superior strength and flexibility. The smooth inner wall provides for no output reduction, allowing for full appliance efficiency, ease of cleaning and regular maintenance. The smooth inner wall optimizes gas flow, minimizes back pressure, and facilitates condensate management. Only flexible chimney liner listed to UL 1738 standard. What's