Chimney Liner Sizing Calculator

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. So in the example above where the fireplace had 1080 of area it should be divided by 10 which means a liner with 108 of area is needed. Chimney liner and flue pipe length calculator select pipe or liner type.

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