DuraVent 4 in. Dia x 8.5 in. Gas Vent High Wind Cap for Chimney Pipe

Type B Gas Vent designed to the demands of the common category I appliance installation. Engineered to heat up rapidly and remain hot during the appliance operation to allow for minimal condensation. An innovative system for a lock tight connection called DuraLock.|Use with natural gas and Liquified Propane (LP) category I appliances with a draft hood|4 in. Dia high wind top withstands up to 40 MPH winds|Aluminum inner wall and gallon volume outer wall construction that features a industry leading twist-lock design|Baffling prevents back drafting of vent gases caused by high winds