HY-C BBT1414 BigTop Multi-Flue Chimney Cover, Black Galvanized Steel, 8" H x 14" x 14" - With Minimum 17" x 17" 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 14" x 14" from screen to screen. Requires a 17" x 17" masonry chimney top for 24-gauge galvanized steel base flanges to mount properly. Hood measures 20 1/4" x 20 1/4". 24-Gauge removable galvanized steel hood with scalloped corners and roll-formed edges allows for extra strength and easy cleaning. Attractive black powder coat finish helps it to stand up to the elements. Made with 18-Gauge 3/4" galvanized steel expanded metal mesh. BigTop Multi-flue Chimney Cap acts as a spark arrestor to prevent most ascending sparks from reaching the outside. Not recommended for use in situations where oil or coal is burned or when wood/pellets are used as primary source of heat. 7 Year Limited Warranty. Made in the USA.