Boosts cooling efficiency: seals around the portable AC exhaust hose to prevent hot room air from entering and cooled air from escaping for faster, more effective cooling. Energy efficient operation: supports better AC performance and can help reduce energy consumption and electricity costs over time. Universal fit design: flexible cloth construction fits most portable AC exhaust hoses and adapts to common window setups for easy use. Easy installation: attaches with adhesive tape for a quick, secure fit without drilling or tools. Durable, reusable material: soft, tearresistant cloth designed for repeated setups and easy cleaning. Use scenarios In small apartments, dorm rooms, or office spaces with a portable AC, install to minimize air leakage and improve cooling efficiency. In rentals or temporary spaces where window modifications are not allowed, a quick, tool installation helps you stay comfortable. In RVs, campers, or outdoor events using portable AC units, the flexible cloth adapts to curved hoses and irregular mounting points to maintain performance.