Allows for the flammable clearance required for through-wall venting. Use with 6" DuraVent Type B Gas Vent pipes. Adjusts to accommodate walls with 3.5" to 6" thickness. 25-year warranty included. This unit necessitates a venting pipe with a 6" inner diameter. When it comes to quality chimney installation products no one is able to surpass the name of Dura-Vent Type B. With their Gas Vent Wall Thimble - For Vent Pipes with a 6 inch Diameter you have the device that you need to install in your chimney to give to it the needed efficiency so that when winter decides to hit in fully furry you can sit in front of your fireplace and soak in all of the heat that it provides you.

Provides required combustible clearance for through-wall venting For use with 6" Dura-Vent Type B Gas Vent pipes Adjusts to accommodate walls with 3.5" to 6" thickness 25-year warranty