DuraVent Concentric Vent System 3" x 5" x 36" Black Vent Pipe Length h57.75 18-inch curved fan blades for

18-inch curved fan blades for optimal air movement with a maximum CFM of 6360

000 Overall Width 20"

Diameter 19 inches  25 inches  Heat Rating 147

Note: The SIU Series of Infrared Tube Heaters give you the same options you like from the SIS Series

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DuraVent Concentric Vent System 3" x 5" x 36" Black Vent Pipe Length h57.75 18-inch curved fan blades forAn economical venting solution for condensing and noncondensing appliances, the Concentric Venting System (CVS) features a UL1738 approved super ferritic stainless steel inner wall. The proprietary twist lock connection eliminates use of clamps or mechanical fasteners and saves installation time. Only one penetration is needed through the roof or the wall for both exhaust and combustion air. Multiple pipe lengths and telescoping pipe extensions