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Metal-Fab's round and oval Type-B vent is listed by Underwriters Laboratories for use with approved category 1 gas furnaces, heaters, and boilers. A category 1 appliance operates with a non-positive vent static pressure. The double wall design of B-vent enables the product to be used in homes and commercial buildings at close clearance to combustibles. Metal-Fab's B-vent design incorporates features that make installation quick, easy, and safe. Some of those features are: Elimination of sharp edges by hemming the flue and casing; Assembly & disassembly, without tools, using positive twist lock; -- UL listed to mate with other specifically identified and listed round gas vent, 3" thru 6" diameters, allowing you to add a new run of Metal-Fab B-vent to an existing run of common vent. Metal-Fab 3"-6" diameter B-vent pipe is now standard with new Surelock® B-Vent Locking System. The patented locking system provides a secure lock with just the push of a tab, and can be easily disassembled by pulling the tab back out.