The Black Galvanized Steel Shelter chimney cover is the durable and economic choice for chimneys in most regions. The outside mounting design provides maximum free air space and better draft while the attractive powder coat finish helps it stand up to the elements. Made with a 24-Gauge galvanized steel hood with scalloped corners and roll-formed edges, 18-Gauge 3/4 in. expanded galvanized steel mesh, 14-Gauge galvanized steel bases and slotted hex-head bolts.. Fits outside tile dimensions: 11.5 in. x 16.5 in. to 13.5 in. x 18.25 in.. Galvanized steel construction. Quick and easy installation requires only a screwdriver. Chimney caps act as a spark arrestor to prevent most ascending sparks from reaching the outside. Not recommended for coal or oil burning appliances. Outside mounting design provides maximum free air space and better draft while attractive powder coat finish helps it stand up to the elements. <br /><br /><center><img src="https://inlinecontent.thdstatic.com/22/HY-C COMPANY LLC/1081144.jpg"></center><br />. Shape: Rectangular. Accessory Type: Chimney Cap. Material: Metal