Chimney has been meeting the supply and accessory needs of over 8,000 Chimney sweepers retailers and contractors for over 25 years. Chimney is privileged to serve over 80% of Chimney professionals in America. Founded by Robert Daniels Sooty Bob in 1978, Chimney has grown from a one-man operation to a national network of six warehouses and a manufacturing plant. From its headquarters in Fairfield, Iowa, Chimney plays an important role in supplying the sneaker industry. DirectVent Pro is a unified coaxial vent system designed for use with direct vent gas or propane stoves, heaters, and fireplaces. Protects direct vent pipes vented through the roof. Durable galvalume construction. Compatible with DirectVent Pro vent products. 6 5/8 pipe opening. Available in two tone ranges. Limited useful life. Separately purchased storm collar required