11" DuraPlus Square Ceiling Support Box is used with flat, vaulted, or cathedral ceilings. Square Ceiling Support Box is painted black. Supports up to 35' of DuraPlus Chimney. Starter Section built-in. Trim included. DURA PLUS TRIPLE WALL SQUARE CEILING SUPPORT BOX

• 14.25 x 14.25 x 11.
• Deep painted black.
• Used with flat to 4/12 pitch ceilings.
• Starter section built in supports up to 40 ft. of Dura Plus chimney.
• Includes square trim.
  

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Carcinogens: This product can expose you to chemicals including Lead, which is [are] known to the State of California to cause c