M G Duravent 8DP-VC 8 Inch Dura-Vent Dura/plus Chimney Cap Stainless 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.