Efficient seal for portable air conditioners: fits sash windows with a perimeter of 380–460 cm, blocking warm outdoor air from reentering and directing the exhaust outside through the unit outlet. Robust zipper closure: extrastrong closures securely hold the hose in place. Includes reusable cable ties for secure attachment. Insect and moisture protection: reduces insect entry and moisture ingress, helping keep the indoor space comfortable and dry. Wide compatibility and durable material: suitable for single or dualhose portable AC units from any brand. Made from UV and waterresistant fabric that is washable at 40°C. Use scenarios: Living room or bedroom cooling with a portable AC in a sash window for efficient, reversible setup. Temporary rental or shortterm deployments where a fast, reliable seal matters. Workshops or garages using a dualhose unit to maintain a controlled, pest environment.