Chimney Liner Size Calculator and Selection Guide
Why do I need to choose the correct size chimney liner?
Choosing the correct size liner for your appliance is crucial to ensure your appliance or stove is running properly. The chimney liner should never be undersized for any appliance, especially to accommodate insulation around the liner. The liner size is the number one factor for the appliance to burn properly. Undersized liners will not allow the appliance to vent properly. This can cause smoke to pour out of the stove and it can also cause gas and oil appliances to fail. The ideal flue size is typically determined by the exhaust outlet of the stove or appliance. The rule of thumb for sizing a chimney liner is that you never want it to be smaller than the appliance exhaust hole and you don't want the liner to be three times the area of the exhaust hole of the appliance.