This Draper 24221 Window Seal Kit for Portable Air Conditioner Units is designed to keep cool air inside and direct warm air outside more efficiently. It is strong, waterproof, and UV stable. The seal is simple to install to the window and its surround using the self-adhesive fastener system. It features a zipped section for the hose to go through and be held in place. The seal is washable and suitable for repeated use. It can be fitted to windows that open inwards, outwards, downwards, and upwards. However, it is not suitable for windows that slide vertically (sash windows). This kit can also be used with dehumidifiers and tumble dryers. The dimensions of the seal are 3,900 x 380mm, and it is supplied with 9m of adhesive strip.