Efficient cooling The seal clips around the exhaust hose of your portable air conditioner or tumble dryer to block warm room air from flowing back in. Tighten the tension rope around the hose nozzle to seal tightly and help your unit cool the room faster. Size and compatibility Available in 200 cm and 300 cm lengths. Suitable for most portable air conditioners, tumble dryers, exhaust dryers, and dehumidifiers. Designed for commonly used tilting or sash windows (left/right opening), bottomhung sashes, and skylights. Not compatible with sliding windows or doors. Easy installation Attach the sealing cloth to the window frame and adjust the tension rope. The waterproof windshield cloth and soft fabric provide a secure, snug fit with no tools or complex steps required. Material and durability Made of sturdy polyester, built to withstand regular use and effectively prevent warm air from leaking into the room, maximizing cooling efficiency. Practical use scenarios Bedroom cooling: use with a window air conditioner to reduce leakage and reach comfort faster. Laundry area: vent a tumble dryer through a window while keeping humidity and heat outside. Small apartments: seal around a skylight or hung window to vent hot air without letting outdoor air in.