The Window Seal enhance indoor cooling,and prevents the cold air from leaking out,and prevents the outdoor hot air from entering. Increases cooling performance and reduces energy consumption. Durable, water-repellent material. The window seal is washable. Suitable for all common window types with a maximum circumference of 300cm, but not for left and right sliding windows or doors. Does not affect the opening and closing of the window. Suitable for all mobile air conditioning units, tumble dryers, condenser dryers, exhaust air dryers and for windows, skylights, and tilting windows. Easy to install. No need to drill holes and buy other installation tools. Simply stick the supplied adhesive tape to the window frame, attach the air conditioning window seal to the window and frame and you're done.