The Square Ceiling Support is used on flat, cathedral, or sloped ceilings. The bottom of the ceiling support must extend a minimum of 3 inches into the room. A Universal Adapter is included to connect Rock-Vent Class A to either single or double wall stove pipe. Supports up to 60' of chimney pipe from a floor or ceiling joist. Constructed of 24 gauge galvalume steel painted black. Square Ceiling Support includes a 2 piece trim collar suitable for any ceiling pitch. Faceplate is 18 gauge stainless steel painted black and is a unique design that doesn't rely on spot weld construction, but utilizes a secure formed edge for long term peace of mind. Measurement Charts: 11” Square Ceiling Support 5” 6” 7” 8” A 5.2” 6.2” 7.2” 8.2” B 11” 12” 13” 14” C Trim 15”x15” 16”x16” 17”x17” 18”x18” YY 11” 11” 11” 11” *Due to many variables beyond our control, the installer should check actual parts for final dimensions. 24” Square Ceiling Support 5” 6” 7” 8” A 5.2” 6.2” 7.2” 8.2” B 11” 12” 13” 14” C Trim 15”x15” 16”x16” 17”x17” 18”x18” YY 24” 24” 24” 24” *Due to many variables beyond our control, the installer should check actual parts for final dimensions.