Part of the chimney system roof assembly, the round top is designed with a dome to exclude rain and leaves and a lower skirt to deflect wind for proper chimney draft. In the Type HT chimney (5 inch, 6 inch, 7 inch and 8 inch sizes), the round top is designed with three legs that slide down over the outside of the chimney. This design makes cap removal for cleaning a breeze. In the ultra-temp and galva-temp chimney (10 inch, 12 inch and 14 inch sizes), the round top is designed with a squeeze collar that fits inside the chimney pipe.