High Efficiency Filters meet the highest standards for air filtration, where precise control of air quality is paramount. These applications might include healthcare procedure rooms, food production, pharmaceutical production, and specialty manufacturing.
The American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) publishes guidelines using Minimum Efficiency Reporting Values (MERV). Filters must achieve MERV-13 to MERV-16 values to be considered High Efficiency.
Performance above MERV-16 is governed by the High Efficiency Particulate Air (HEPA) and Ultra Low Penetration Air (ULPA) standards. HEPA filters must meet a minimum efficiency of 99.97% on 0.3 micrometer particles. ULPA filters must meet the even more rigorous efficiency of 99.999% on 0.3 micrometer (DOP) particles.
Please note that the use of High Efficiency, HEPA, and ULPA filters requires specialized equipment rated for this high level of air filtration.