Efficient Cooling: Create a cooler living space in hot weather. This air conditioner window seal kit blocks the flow of warm air, boosting the efficiency of portable air conditioners, tumble dryers, or dehumidifiers. The result is faster room cooling and a more comfortable environment. Size and fit: Available in 200 cm or 300 cm lengths to suit a range of window openings and appliance exhausts. It works with many portable units and appliances, making it a versatile ventilation solution. Compatibility: Designed for common window sashes that tilt in, open left or right, or bottomhung sashes and skylights. Not compatible with sliding sashes or sliding doors. Adjustable and waterproof: The seal uses a singletube fabric with an adjustable tension rope and waterproof polyester material. It provides a secure, tight seal around the window opening, minimizing air leakage and drafts. Use scenarios: Cooling a living room with a portable AC during summer heat without wasting energy. Venting a tumble dryer or dehumidifier in a workshop or apartment, avoiding warm air recirculation. Sealing a kitchen or laundry area to improve energy efficiency when cooling or drying. Materials and performance: Waterproof polyester; easy to install; durable and reusable across seasons.