1Fitment: Rv refrigerator airing device is replacement for Dometic Models DM26XX and DM28XX (6?8 Cubic feet Models), please confirm whether your model is applicable before buying. 2Function: Not used or stored for a period of time, keep your refrigerator and freezer properly ventilated while in storage with this specially designed airing card. 3For Upper and Lower Door: These effective refrigerators airing devices will work for both upper and lower fridge doors, holding them about 1inch ajar at all times 4Durable Plastics: These rv refrigerators airing cards are made of durable abs, which has high strength and high durability, can be used for a long time. 5Simple Install: The installation process for these airing devices is quick and effortless, requiring only seconds to latch on and off without any complications steps.