Abstract: A vapor degreaser with solvent tank, a liquid heated at the bottom of the tank to produce vapor, condensing coils at the wall of the tank defining a vapor level, and a condensate collector and return, with a freeboard or open space between the vapor level and the open top of the tank for insertion and removal of articles to be cleaned. Inserts are installed at each side of the interior of the tank at the freeboard level to increase the freeboard depth-to-width ratio to meet air pollution control requirements.