Make the most of your portable air conditioner with the Bluebuilt Window Seal Air Conditioner. This universal set ensures that the hot air stays outside and the cold air inside. Windows or doors with a maximum circumference of 400 centimeters can be closed off with this set. The hole to fit the hose of the air conditioner through is adjustable, thanks to the zipper closure. This makes the set suitable for hoses with various diameters, but we recommend not to use hoses with a diameter larger than 25 centimeters.Note: this window seal isn't suitable for a roof window with a center hinge.