HY-C BT1741K BigTop Multi-Flue Chimney Cover, Stainless Steel, 8" H x 17" x 41" - With Minimum 20" x 44" Required Overall Chimney Dimension Attractive chimney cap for multi-flue masonry chimneys. Top-Mount design attaches easily and securely with included tapmark masonry screws and tube of all-weather construction adhesive. Measures 17" x 41" from screen to screen. Requires a 20" x 44" masonry chimney top for 24-gauge 100% 304 stainless steel base flanges to mount properly. Hood measures 22 1/4" x 46 1/2". 24-Gauge removable 100% 304 stainless steel hood with scalloped corners and roll-formed edges allows for extra strength and easy cleaning. Made with 18-Gauge 3/4" 100% 304 stainless steel expanded metal mesh. BigTop Multi-flue Chimney Cap acts as a spark arrestor to prevent most ascending sparks from reaching the outside. Can be used in situations where oil or coal is burned or when wood/pellets are used as primary source of heat. Lifetime Limited Warranty. Made in the USA.