WATERPROOF FUNCTION: The sealing strip of the AC window vent seal kit is made of waterproof polyester material and can also be used in rainy days. Create a cool space for you on a sweltering summer day WIDE COMPATIBILITY: The hot air stop air exchange guard fits windows with a maximum perimeter of 300cm/400cm. It is suitable for skylights, awning Windows, casement Windows or swing Windows that open to the left or right, but not for sliding Windows, vertical sliding Windows or three-dimensional rotating Windows ENHANCE COOLING PERFORMANCE: The 400cm AC window seal helps to exhaust warm air from the air-conditioned room through aircon hose and prevent it from flowing back. It cools your room more effectively, reduces energy consumption, saves electricity costs, reduces carbon dioxide emissions, and protects the environment SAVE ENERGY: The portable universal window seal kit can effectively prevent the entry of hot air, allowing your room to cool down quickly in a short time, enhancing the cooling performance of the air conditioner, helping to reduce energy consumption, decrease CO2 emissions, save your electricity consumption and money EASY INSTALLATION: No drilling or tool supply required. Just stick the portable AC window vent kit to the inner side of the window frame and the window, place the air conditioning hose outside the window, zip it up, and then fix it with cable ties