Allows you to extend the flue outlet tube to fit walls between 13 and 19 inches thick. This may be necessary if you have walls thicker than normal or other space considerations.Extends the flue outlet vent tube to fit walls from 13 to 19 For use in Empire DV210SG and DV215SG gas furnace installations A separately purchased Air Inlet Extension Kit is required to complete installationSize: 3
