Durable Material: Portable AC Unit Air Conditioning Window Kit is made of durable PVC, lightweight and portable, easy to install and remove, suitable for home or office use. 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, block hot air from entering, and save energy. For Sliding Windows: This portable AC window ventilation kit includes 4 panels. The panel length is 16.9 inches, and the combined extension length ranges from 16.9 to 60 inches. It fits most vertical and horizontal sliding windows. Panels can be combined in sets of 2, 3, or 4 to match the window size. Durable: This AC fan set is constructed from PVC material with high-temperature resistance, capable of withstanding prolonged exposure to hot airflow and summer sunlight, resists aging, and is designed for long-term use. Easy Installation: Simple to install and remove without tools, space-saving, and suitable for both home and office environments.