Closed windows despite air conditioning hose. Mobile air conditioners expel warm air from the room through a hose, usually via the window. The Be Cool BC04AIRSTPDF HOTAIRSTOP roof window seal effectively seals open windows up to 400 cm in circumference, allowing the hose to be led outside through the fabric. This saves a lot of energy and keeps not only warm air out: mosquitoes and other pests are also kept at bay! Quick and easy installation. The Be Cool window seal is attached using Velcro tape, which can be removed without residue at any time. Roof windows with a lower hinge can still be opened and closed as usual. The Hot Air Stop seal is made from durable, water-repellent material and is washable up to a maximum of 40°C. The set includes the seal, adhesive tape, and instructions.