You can install this cathedral box on a slightly sloped or flat ceiling using the trim collar that is included with the purchase. The black finish matches other DuraTech components and pipes of appropriate size, and the limited lifetime warranty offers long-term peace of mind. And unlike some other types of ceiling support boxes, this support box can handle an amazing 60 feet of chimney length. If you have to pass your DuraTech 6 inch inner diameter vent pipes through the ceiling, there aren't any better alternatives than this DuraTech 11-inch Square Cathedral Ceiling Support Box.
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