SmartFlex Standard Liner Kits

Guidelines for Sizing Fireplace SmartFlex Liners

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