HEPA filters are the most efficient air filters commercially available. They are used in clean rooms and other applications requiring ultra-clean air, such as: semiconductor, electronics, pharmaceutical manufacturing, food processing, hospitals, and labs. Every filter is individually tested before shipment to assure it meets rated efficiency and resistance. HEPA filters are available in a variety of efficiencies - from 99.97% tested on 0.3 μm particles to 99.99995% and higher, tested on 0.1 to 0.2 μm particles. All filters are available scan tested.