Keep the hot air out of the room: This portable air conditioner window seal is installed between the window frame and the, effectively pushes out the hot air generated by the air conditioner, keeps the cold air in the room and keeps your room cool for a very long time. [Easy to Install]:No drilling and tools required, everything you need is provided. Simply stick the portable air conditioning window ventilation set to the inside of the window frame and to it, place the air conditioning hose on the outside of the window, close it and secure it with the zip. You can open or close it at any time without removing the window seal. [Waterproof Function]:The gasket of casement window air conditioner is made of waterproof material, which can be used even in rainy days. Create a cool room for yourself on a hot summer day. [Improve Cooling Performance & Save]:Air conditioner window seals are made of durable material, which can effectively block the entry of hot air, let your room cool quickly in a short time, improve the cooling performance of the air conditioner and help reduce energy consumption, reduce carbon dioxide emissions, reduce your power consumption and save your money. Wide application: the 400 cm crank outdoor window set for air conditioners is suitable for both extendable and retractable window types and is suitable for all portable air conditioners.