3M12A - Type-B Gas Vent Adjustable Pipe Length - 3" to 8"

Metal-Fab 4M12A - Type-B Gas Vent Adjustable Pipe Length - 3" to 8" Metal-Fab is the only B-Vent manufacturer with UL approval to connect the male end into the female end of all competitive UL listed B-Vent brands, increasing product versatility. Did you know that by simply connecting using three (3) quarter inch sheet metal screws to secure creates a UL listed connection? Material Specifications The outer wall is constructed of galvanized steel, .018" thick G-90 for sizes 3" to 14" diameter, and .024" thick G-90 for sizes 16" to 30" diameter. The inner wall is constructed of aluminum alloy, .012" thick for sizes 3" to 8" diameter and .018" thick for sizes 10" to 30" diameter. The vent includes an integral, annular insulating air space, ¼" thick for sizes3" to 6" diameter and 1/2" thick for sizes 7" to 30" diameter. Features: Type B Gas Vent For use with approved gas furnaces, heaters, fireplaces and boilers Meets or exceeds all recognizes gas venting codes UL listed to adapt to ident