Glass microfiber filter media are comprised primarily of glass microfibers and are produced with a wet laid process similar to that used for the production of paper.Our offers range from various ASHRAE grades (F6-F9),HEPA grades (H 10-H14) to ULPA grades (U 15-U16) with exceptional dust holding performance and providing the highest available efficiency at a minimal resistance to air flow.Our products are available in laminated form to help solve special air filtration requirements.