Metal-Fab 4" to 7" Type B Round Chimney Pipe Increaser - 4MIX7

Want to expand your 4" round chimney pipe to 7 inches? You can do it easily with Metal-Fab's chimney pipe increaser. This Type B chimney pipe increaser has a .018" galvanized steel outer wall with aluminum alloy inner wall, allowing a 1" clearance to combustibles. There are no sharp edges. And one of the things that makes this chimney pipe increaser so desireable is that Metal-Fab's design offers a secure locking system which means that no tools are required. The 4" end is also compatible with other brands of round gas vent pipe.

• Allows connection of 4" and 7" pipe
• .018" galvanized steel outer wall and aluminum alloy inner wall
• Double-wall design allows a 1" clearance to combustibles
• For use with Metal-Fab Type B Round Chimney Pipe
• Secure locking system requires no tools
• Hemmed flue and casing eliminate sharp edges
• 4" end is compatible with other brands of UL Listed round gas vent pipe (see list below)
• Listed to UL 441
• Limited one-year warranty
• Specifications:
• Small End: 4" Dia.
• Large End: 7" Dia.
• Height: 8.5"

3" to 6" pipe sizes are compatible with the following brands of Type B gas vent pipe:

• General Products Co. - Airjet
• American Metal Products Co. - Amerivent
• Hart & Cooley - Metlvent
• Household Manufacturing Inc. - Metalbestos and Airmate
• Mitchell Metal Products Inc. - Mitchvent
• Selkirk Metalbestos - Metalbestos
• Simpson Dura-Vent Inc. - DuraVent
• ECCO Heating Products - ECCO Manufacturing