1.Easy installation: this mobile air conditioning sealing cloth is designed for skylights and swing windows with a circumference of 380 or 460 cm. Simply measure the four sides of your window, attach the included tape to the window frame, secure the seal to the window, and you can enjoy efficient cooling without warm air. 2.PREVENTS REFLUX: Our window seal effectively blocks warm outside air from reentering your airconditioned room, while hot exhaust air is directed outwards through the hose. This helps maintain cooler indoor temperatures and improves the efficiency of your portable air conditioner for better comfort in hot weather. 3.REINFORCED FOR ZIPPER With extra strong zippers that resist automatic opening when the exhaust hose is in use, this sealing cloth provides reliable performance. Additional reusable cable ties are included for superior attachment and support so your seal stays securely in place even during continuous operation. 4.Weather Protection: This window seal provides excellent protection from outdoor elements and prevents moisture from entering your home. Made of thickened polyester with silver coating, the material is water resistant and can be washed at 40 C for a long life.