6" X 18" Ceiling Support Flat to 12/12 Pitch - 18"

6" x 11" - ceiling support with 6" ID x 11" deep for ceilings that are Flat to 12/12 Pitch - the box is 14" x 14" square at the base and hangs down into the room at least 2" on all sides. You need to add 2x4 blocking in the ceiling as needed to attach this box on all 4 sides. The support box needs to hang into the room far enough for the interior pipe to be the proper clearance horizontally from any combustible materials, 18" for single wall pipe and 6" for single wall pipe with pipe shields or double wall close clearance interior stovepipe.