A rigid, extended surface air filter that is engineered to provide medium and high efficiency air filtration with long filter lifecycles. Because of its rugged metal and plastic frame construction, the Multi-Flo is capable of operating in a wide variety of air handling systems and is an excellent product for variable air volume (VAV) applications where changes in airflow might render a non-rigid filter ineffective. Available in a single-header or non-header configuration, making it easy to install in any side access or front access housing. Widely used in hospitals, manufacturing plants, automotive plants, office buildings, universities, pharmaceutical laboratories, and many other commercial and industrial applications. Ultrafine glass fibers are formed into a progressively dense, high loft blanket, which provides a high dust holding ability and low resistance to airflow. Designed specifically for use in high efficiency air filtration, this media has a long record of proven reliability, even under extreme atmospheric conditions.