For use with a powered respirator or compressed-air supply, the Sundstrom SR 520 respirator hood is a lightweight and Comfortable face shield that helps provide reliable respiratory protection. It features a fixed, flexible breathing tube which connects to a respirator fitted with the relevant filters, and conveys breathable air to the wearer in hazardous working environments. The cellulose acetate visor also provides protection against impact and chemical splash while the continuous airflow keeps the visor demisted to maintain excellent vision.