Round black galvanized chimney caps from HomeSaver Pro and HY-C feature support tabs and adjustable screws for easy installation. Measure the outside diameter of the chimney and size up: 7 to 9 inches takes an 8 inch cap, 9 to 11 inches a 10 inch cap, 11 to 13 inches a 12 inch cap, 13 to 15 inches a 14 inch cap, 15 to 17 inches a 16 inch cap, and 17 to 19 inches an 18 inch cap.
