Selkirk-Metalbest Metalbest Sure-Temp 6" Class A Chimney Pipe Ceiling Support Box

6" Class A Chimney Pipe Ceiling Support Box from Sure-Temp The Support Box is intended for use when installing chimney in an A-frame, in a mobile home or in a ceiling under a narrow section of roof. It provides a finished installation at the ceiling level and will support up to 20' of chimney. The part also provides shielding from insulation when installed in an unoccupied attic space. The Support Box assembly is comprised of a black box designed for installation inside 16" O.C. joists, a cylindrical shi...