8 Inch Inner Diameter Wall Thimble for Chimney Pipe - Fireplace Ventilation Kit for Wood Stove, Pellet Stove & Gas Fireplace Installation

The Wall Thimble is used for through-the-wall chimney installations.  It protects the wall as the chimney passes safely through to the outside, and provides a finished look to the framed opening on the inside.

The Wall Thimble can adjust to accommodate walls from 6 to 10 inches thick.