If the evaporator fan unit on your Avantco open-air merchandiser is broken or no longer working properly, be sure to replace it immediately with this Avantco evaporator fan unit for MCAC-36 units. An evaporator fan blows air over a cooled evaporator coil to chill the air as it enters the refrigerator cabinet, so that your refrigerator remains at food-safe, cold temperatures at all times.