A: First, HEPA refers to High-Efficiency Particulate Arrestance and these commercial air filters capture the smallest airborne particles classified as sub-micron in size and as a result, provide better health benefits.
An industrial HEPA filter is rated by using efficiency values at most penetrating particle size (MPPS). These efficiencies can range from a low level of 99.97% at 0.3 micron to a high efficiency level of 99.9995% at 0.12 micron. This makes these commercial air filters in a different class than, for example, an HVAC filter. The filters are typically used in semi-conductor manufacturing facilities to eliminate contamination