Waterproof: The window air conditioner seal is made from waterproof polyester material and can be used even in rainy weather. It creates a cool space for you on sweltering summer days Enhanced Cooling Performance: The air exchange shield helps expel hot air from the air-conditioned room through the air conditioning hose and prevents it from flowing back in. It cools the room more effectively, reduces energy consumption, saves on electricity bills, cuts carbon dioxide emissions and protects the environment Removing hot air from the room: This portable air conditioner window seal is installed between the window frame and the window using a hose, effectively expelling the hot air generated by the air conditioner out of the window whilst keeping the cool air inside, ensuring your room stays cool for longer Easy to install: No drilling or additional tools required. Simply stick the portable air conditioning window ventilation kit to the inside of the window frame and the window pane, position the air conditioning hose outside the window, zip it up, and secure it with cable ties Wide compatibility: The 300 cm air conditioning tilt-and-turn window kit is suitable for both outward-opening and inward-opening window types, and fits windows up to 118 inches in circumference. It is suitable for skylights, awning windows, casement windows, or tilt-and-turn windows that open to the left or right; it is not suitable for sliding windows, vertical sliding windows, or pivot windows