HY-C SCC1313 Shelter Bolt On Single Flue Chimney Cover, 5/8" Mesh Compliant with NFPA 211 and California Building Standards, Fits Outside Existing Clay Flue Tile Dimensions 13" x 13", Black Galvanized Steel Outside mounting design provides maximum free air space and better draft while attractive powder coat finish helps it stand up to the elements Fits outside tile dimensions 11" x 11" to 13" x 13" Made with a 24 gauge galvanized steel hood with scalloped corners, 14 gauge galvanized steel base and slotted hex-head bolts Made with 18 gauge 5/8" spark arrester mesh to comply with NFPA 211 and California building codes Made in the USA; Five (5) Year Limited Warranty