This Insul-Plug blocks old, unused thimble holes in masonry chimneys. It provides a thermal break from combustibles and prevents downdrafts from entering the room.
Features
- Constructed of a ceramic-based fireproof insulating material
- Black outside plate covers up to a 10″ diameter hole
- Simply insert it into the old thimble opening and tighten the expansion screw on the face
- The sides expand and create a tight fit inside the thimble opening
- It can be removed by reversing the process
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