The DuraVent 10DCA-CTF is a chase top flashing from the DuraChimney II, applicable for your all-fuel chimney system. With an included spacer clips, this is to be used to enclose the chase top while providing a ventilation air passage to it. It has a inner diameter of 10 inches and has a dimension of 34 inches. This is a UL-listed product and is covered by DuraVents limited lifetime warranty.Innovation and style has been the trademark of DuraVent throughout the years in the venting industry. Get one of their products here at PlumbersStock.com.