Window Sealing Strip for Portable Air Conditioner (fits hose exhaust systems, max circumference 2/3 m) Key benefits Keeps rooms cooler and reduces AC runtime by sealing the gap around the portable AC exhaust hose so warm outdoor or indoor air cannot re-enter the room. Blocks insects, dust and mosquitoes for a cleaner, more comfortable living space. Durable, waterproof construction ensures long-lasting performance and low maintenance. How it works The sealing strip locks the exhaust hose between the window sash and frame, creating a tight barrier that prevents hot air infiltration and insect entry while the portable AC operates. Material and performance Made from high-quality polyester fibre: waterproof, tear-resistant and easy to clean. Helps improve cooling efficiency and reduce energy consumption by minimizing air exchange around the exhaust hose. Compatibility and size Universal design for use with portable air conditioners that vent through windows. Fits folding skylights, extendable casement windows and flat casement windows with a maximum window circumference of 2/3 m. Please measure your window circumference before purchase to confirm fit. Simple installation Installs by placing the sealing strip over the exhaust hose and closing the window or sash to clamp it in place; no tools required. Practical use scenarios Bedroom: Use with a portable AC to keep nighttime cooling efficient and prevent insects from entering through a partially open window. Home office or living room: Maintain consistent indoor temperatures while the AC runs and reduce energy costs from frequent compressor cycles. Skylight installation: Seal the exhaust hose passing through folding skylights to stop warm air and pests from entering. What makes it stand out Combines waterproof, durable polyester construction with a straightforward clamp-style installation that works with multiple window types. Specifically designed to lock the portable AC hose between the window frame and the window, offering an effective seal without permanent modification. Note Verify that your window circumference does not exceed 2/3 m before ordering.