Metal–fab 3MDC4 3 Inch To 4 Inch Draft Hood Increaser – For Use With Type B Round Chimney Pipe

Product Features

• Allows 3" draft hoods to connect to 4" B-Vent pipes
• .018" galvanized steel outer wall and .012" aluminum alloy inner wall
• Double-wall design allows a 1" clearance to combustibles
• 1/4" insulating air space
• 5.5" height
• For use with 3" Metal-Fab Type B Round Chimney Pipe
• SureLock locking system creates secure connections without tools
• Hemmed flue and casing eliminate sharp edges
• Compatible with other brands of 3" UL Listed round gas vent pipe (see list below)
• Listed to UL 441
• Limited one-year warranty