Made in the USA, this Big Top Multi-Flue Chimney Cap by HY-C Company is a smart choice for multi-flue chimneys in most regions. Made with a 24 gauge removable 100 Percent 304 Stainless Steel hood with scalloped corers and roll-formed edges it also features 24 gauge 100 Percent 304 Stainless Steel hinged base flanges for secure mounting. The 18 gauge 304 Stainless Steel 3/4 expanded metal mesh is available in 8 , 10 and 14 heights. Available in many stock and custom sizes and can also be ordered in 18 gauge 304 Stainless Steel 5/8 expanded metal mesh to meet California requirements. Chimney caps act as a spark arrestor to prevent most ascending sparks from reaching the outside. Recommended for use in situations where Oil or Coal is burned, or when Wood/Pellets are used as primary source of heat.Flange to Flange 17.5 x 39.5