This Avantco 18939526 evaporator coil is a direct replacement for the one that came standard on BVAC-36 and WVAC-36 series air curtains. An essential part of any refrigeration system, the evaporator coil runs refrigerant through a coiled frame, absorbing heat from the interior of the unit and cooling it down. If the evaporator coil in your unit is broken be sure to fix it promptly.