Dura Vent DuraPlus 9284 8-Inch Chimney Cap DuraPlus Collection 8" Class A Chimney Pipe Chimney Cap with Spark Arrestor. Removable screws allow for cleaning of the chimney and spark arrestor screen. Stainless Steel DuraPlus is designed to stay cool on the outside. DuraPlus Chimney is a triple-wall, all-fuel chimney for use with wood stoves, fireplaces, furnaces, boilers, stoves, ranges, water heaters.