Hy-C Co. SC1318 Chimney Cover 13&quot; x 18&quot; Black Steel Chimney Cover Fits Outside Tile Dimensions 11-1/2&quot; x 16-1/2&quot; To 13-1/4&quot; x 18-1/4&quot;.13&quot; x 18&quot; black steel chimney cover fits outside tile dimensions 11-1/2&quot; x 16-1/2&quot; to 13-1/4&quot; x 18-1/4&quot;. Made in U.S.A. Factory Warranty Easy Installation Safety and Low Maintenance Optional Leg Kit (SCLK): For use when the masonry flue tile does not extend above the crown of the chimney Fits outside tile dimensions: 11.5&quot; x 16.5&quot; to 13.25&quot; x 18.25&quot;