Please Note: These are general guidelines for sizing a fireplace liner, and there are many other factors and considerations to take into account when working on the job site. Please contact our qualified Sales Team for more information. See Additional Product Info Tab for installation Instructions and Sizing Charts.

Liner Opening to Fireplace Opening (square inches) Ratio for Flue Liners:

· Round Liner 12 : 1

· Oval Liner 10 : 1

· Square Liner 10 : 1

· Rectangle Liner 10 : 1

Pre-Calculated Round Liner Chart at 12 : 1 Ratio

Liner Diameter	Liner Opening (square inches)	Fireplace Opening (square inches)
6”	28.26	339.12
7”	38.47	461.58
8”	50.24	602.88
9”	63.59	763.02
10”	78.50	942
11”	94.99	1139.82
12”	113.04	1356.48
13”	132.67	1591.98
14”	153.86	1846.32