1Durable Material: Portable AC Unit Air Conditioning Window Kit is made of durable PVC, light and portable, easy to install and remove, and suitable for home or office use. 2Good Sealing: Insert the board into the window rail and tighten it to achieve a good sealing effect, which can keep your room always cool, no air conditioner leakage, prevent hot air from blowing in, and save energy. 3For Sliding Windows: This portable AC window ventilation kit comes with 4 panels. The veneer length is 16.9", and the combined extension length ranges from 16.9" - 60". It is suitable for most vertical and horizontal sliding windows. Combinations of 2, 3, or 4 pieces can be used to suit the size of the window. 4Durable: This AC fan set is made of PVC, which has better high-temperature resistance, can withstand long-term thermal airflow and summer sunlight, is anti-aging, and can be used year after year. 5Easy Installation: It is easy to install and remove without tools, saves space, and can be used at home or in the office.