The right HVAC system components will make all the difference. Get this discount DuraVent 8DLR-KXC18 DuraLiner Round Extend-A-Cap Kit, 8" x 13" x 18" (4886). This is easy to install, whether you are a novice or experienced DIYer. Use to terminate DuraLiner at the top of the masonry chimney. Kit includes: Base Plate, Support Clamp, Storm Collar, and Cap. Pipe not included.