Ashley Wood/Coal Furnace Convection Blower Gasket. This gasket installs between the unit and convection/distributionblower.Thegasket creates a seal between the blower and the body of the furnace.This helps ensure that all air being circulated around the stove is directed through the unit's heat exchanger. It is suggested that this gasket bechanged if you are replacing the distribution blower or if it begins to show signs of deterioration.