This Avantco 18936952 evaporator coil is a direct replacement for the one that comes standard on WVAC-28HC and BVAC-28HC air curtain merchandisers. The evaporator coil is a vital part of your equipment's refrigeration system, as it is the part of the system where the refrigerant absorbs heat and creates the cold air that is keeping your products at a cool temperature. If the evaporator coil in your unit is broken, be sure to fix it promptly.