This Avantco 19386317 night curtain is a direct replacement for the one that came with your Avantco air curtain merchandiser. If your Avantco HAC-28W or HAC-28B air curtain merchandiser's night curtain is broken or no longer working properly, be sure to replace it immediately. This curtain reduces wasted energy and keeps food cold during overnight hours. It is designed to cover most of the front of your air curtain merchandiser so that you don't need to worry about cold air escaping during off hours. It also helps to make sure your food stays cold between shifts.