The Soler and Palau PER-630 W is a plastic louvre back draught shutter designed for use in ventilation systems to prevent backflow of air. Its durable plastic construction ensures long-lasting performance, while the louvre design allows air to pass efficiently in one direction. The PER-630 W is suitable for residential, commercial, and light industrial applications, providing a practical solution for maintaining proper airflow, system efficiency, and indoor comfort.