3", pellet vent wall 9" x 9" thimble, use to provide required 3" clearance to combustibles, fits between standard wall studs, comes with an insulation ring to cut drafts where the pipe slips through the thimble, designed for stoves that burn wood pellets, patent pending venting for stoves & inserts that use wood pellets, ul listed for 3" clearance to combustibles in usa & Canada.
WARNING: This product can expose you to chemicals including Chromium (hexavalent compounds) which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov