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The chart below uses a 10-1 ratio. A 10-1 ratio should be used for chimneys less than 25 feet in height and a 12-1 ratio for chimneys greater than 25 feet in height.
Fireplace Opening |
Liner Size |
Up to 600 sq. in | 9″ Chimney Liner |
601 – 760 sq. in. | 10″ Chimney Liner |
761 – 942 sq. in. | 11″ Chimney Liner |
943 – 1140 sq. in. | 12″ Chimney Liner |
1141 – 1356 sq. in. | 14″ Chimney Liner |
1357 – 1846 sq. in. | 16″ Chimney Liner |