Fits windows up to 400 cm wide. Simple install: apply the included adhesive tape to the window frame, position the seal over the sash and frame, and thread the air conditioner hose through. Improves cooling efficiency. Sealing gaps around the unit reduces air leakage, helping the local AC cool faster and maintain a stable temperature, which lowers overall energy use. Energy and comfort benefits. Reduces energy consumption and carbon dioxide emissions in hot weather; blocks insects such as mosquitoes and helps prevent moisture intrusion. Secure hose attachment. Reinforced, extrastrong zipper design keeps the hose in place and prevents accidental opening. Durable and compatible. Made from robust, flexible material that adapts to most portable air conditioners and common window configurations. Use scenarios Living room during heat waves to cut cooling costs while staying comfortable. Bedroom or home office to maintain a steady overnight temperature. Temporary or rental setups where quick, tool window sealing is advantageous.