Durable Material: The 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 track and tighten to achieve a secure seal, helping to keep your room cool, prevent air leakage, block hot air from entering, and improve energy efficiency. For Sliding Windows: This portable AC window venting kit includes 4 panels. The panel length is 16.9 inches, with an adjustable extension range from 16.9 to 60 inches. Compatible with most vertical and horizontal sliding windows. Panels can be combined in sets of 2, 3, or 4 to fit various window sizes. Durable Construction: Made of PVC material with enhanced heat resistance, designed to withstand prolonged exposure to warm airflow and summer sunlight. Resistant to aging for long-term, repeated use. Easy Installation: Simple tool-free setup and removal, space-saving design, ideal for both home and office environments. Note: Due to lighting and screen setting differences, the actual product color may vary slightly from images. Slight dimensional variations may occur due to manual measurement.