Ventis Class-A All Fuel Chimney (304L) — a complete, UL-listed factory-built chimney system for wood stoves, furnaces, and fireplaces. Double-wall insulated pipe with a 304L stainless inner liner, welded seams, and a lifetime transferable warranty. Available in 6" and 8" diameters with all supports, shields, flashings, and caps needed for ceiling or through-the-wall installations.