SAFETY: OUTPRIZE DOT approved RV windows are built with tempered glass, ensuring exceptional durability and robust resistance to cracking, chipping, and shattering. The tinted glass not only safeguards your privacy but also provides protection against sunlight and heat DURABILITY: The horizontal RV window features anodized aluminum framing that prevents corrosion and significantly extends its lifespan. The included black trim ring ensures a tidy and swift installation process while enhancing stability and reducing aerodynamic drag for optimal performance VENTILATION: Our horizontal sliding RV window is thoughtfully equipped with a fine mesh screen that effectively keeps insects at bay while permitting a steady fresh air flow. Additionally, it boasts an ingenious ribbed seal design, which aids in maintaining a comfortable temperature inside your RV—keeping it cool during the summer and warm in the winter. This enhances your comfort and reduces the reliance on heating and cooling systems, leading to significant savings on energy bills COMPATIBILITY: The Rough Opening is 30" Width, 24" Height, it is the actual measurement, and suitable for 15/16" or 1-3/8" and slightly thicker up to 1/16" walls(For slightly thicker walls, there may be small gap between the trim ring and the window frame after installation, it is acceptable as long as the gap is invisible. For far thicker windows, you may need DEEPER TRIM RING), please measure the opening carefully before buying or installing. The Overall is 31 3/4" Width, 25 3/4" Height. Please get in touch with us if there are any questions about installation Please search B0DNPYYFML to find deeper trim ring for 3/5" and 1-3/4" thickness wall Customer Service: OUTPRIZE prioritizes product quality and stands by our commitment to customer satisfaction. If you encounter any issues, we're here to help The large, tempered, tinted glass surface on this RV window will let natural light enter your rig abundantly, brightening the space without compromising performance. The tempered glass provides this window with superb durability, offering great resistance to cracking, chipping, and shattering. It is ingeniously designed with a ribbed seal to form a tight barricade against moisture, insects, and even airflow. The trim secures the perimeter to keep out unwanted drafts and heat. By using lightweight aluminum, this window is sleek and aerodynamic-reducing drag which translates into better fuel efficiency.