The Lightweight Venting Solution that uses a locking-tab design, ensuring immediate and tight assembly. Using a 12 5/8” inner diameter and a 15 5/8” outer diameter, it is rated for any solid fuel Isokern Fireplace. This versatile system has been tested and approved for use with Isokern Standard and Magnum fireplaces in typical or Fire-Lite applications. Available in air-cooled (Eco-Steel) or insulated (Eco-Steel+).