1. 【Durable 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. 2. 【Good Sealing】: Insert the board into the window rail and tighten it to achieve a good sealing effect, which can keep your room cool, prevent air conditioner leakage, and stop hot air from entering, helping to save energy. 3. 【For Sliding Windows】: This portable AC window ventilation kit includes 4 panels. The panel length is 16.9", and the combined extension length ranges from 16.9" - 60". It fits most vertical and horizontal sliding windows. Combinations of 2, 3, or 4 pieces can be used to match the window size. 4. 【Durable】: This AC fan set is made of PVC, offering better heat resistance, able to withstand long-term thermal airflow and summer sunlight, is anti-aging, and reusable year after year. 5. 【Easy Installation】: It is simple to install and remove without tools, space-saving, and suitable for home or office use.