DuraVent FasNSeal Flex 10" x 200' Stainless Steel Custom Flex Length btu225000 all horizontal sections should be

all horizontal sections should be as short as possible and have a minimum slope of 1/4" per foot

HE36 Air Space on Sides YES Brand Heatilator

Brand DuraVent Series FasNSeal Flex Model 5FSFLEX-30

Designed for use with HE250R

the popular linear style

DuraVent FasNSeal Flex 10" x 200' Stainless Steel Custom Flex Length btu225000 all horizontal sections should beMade 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