Top vent option (Designed for use with Masonry or Class A chimneys only). Manufactured by Hearth & Home Technologies (part number 1-00-677120) and sold by Doug Ashy as a special-order item in our venting and outside air selection. Check the Compatible With information on this page against your fireplace, stove or venting system before ordering, since sizes, fuel types and finishes are specific to each model. Installation should be done by a qualified installer following the manufacturer's installation manual and local code. Request a quote to confirm pricing, availability and lead time.