METAL-FAB® 4MFS 4 in B-Vent Firestop Spacer

Metal-Fab round B-Vent has been evaluated and listed by UL, Inc., to mate with other specifically identified brands in 3-6"" diameters at both ends as follows: Amerivent, AirJet, ECCO (E/R), Hart & Cooley B-Vent, M&G Type B, Mitch Vent, Energy Vent (Selkirk). At the male end of compatible gas vent, add an adapter or adjustable length (M6A, 12A, or 18A) then add sections of Metal-Fab pipe. At the female end of the compatible vent simply insert the male end of a Metal-Fab B-Vent into the compatible gas vent and secure per instructions.