The Glasfloss Magna HT frame shall be made of heavy duty aluminized steel. The media shall be constructed of water resistant, inorganic glass microfiber. For quality assurance, the glass microfiber media rolls are randomly tested and certified to meet minimum efficiency requirements by the media manufacturer. The media pack shall consist of a continuous sheet of pleated glass microfiber. The pleated media pack is separated with multiple rolled-edge corrugated aluminum separators. Aluminized faceguards and support struts are installed on the air entering and air leaving sides of the frame to ensure filter integrity and increased rigidity. Operating temperatures range from 350 to 750 degrees Fahrenheit. A 1/8″ thick high temperature rope gasket shall be applied to the filter. The 350, 500 and 750 Series Magna HT filters shall be classified under U.L. std. 900.