DuraTech: Square Ceiling Support Box
Supports Chimney pipe and provides a positive connection between support box and chimney with a built-in-twist-lock. Suitable for both flat and cathedral ceiling applications. Also use in short attic spaces. Fits between standard 16" on-center joists and most manufactured home applications. Supports up to attach DVL or DuraBlack to the support box. A 2" wide trim collar is included. Painted black.
Available for 6" and 8" Double Wall.