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Cathedral Ceiling Support Box Ceiling Pitch Sizing Chart

DuraBlack / Single Wall Pipe          DVL / Double Wall Pipe          Use

0/12 to 4/12                                   0/12 to 6/12                           11" Support Box

5/12 to 9/12                                   7/12 to 13/12                         24" Support Box

10/12 to 14/12                               14/12 to 20/12                       36" Support Box