8" DuraVent DuraPlus Square Ceiling Support Box - 8DP-CS24
This square ceiling support box is used with flat, vaulted, or cathedral ceilings. Supports up to 35' of DuraPlus chimney. Starter section built-in. Trim included.
WARNING: Carcinogens: This product can expose you to chemicals including Lead, which is [are] known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.