4MO45F - Type-B Gas Vent Oval 45 Degree Flat Fixed Angle - 4"Metal Fab 4MO45F Type B Gas Vent Oval 45 Degree Flat Fixed Angle 4" 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, .
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