What is the definition of HEPA filtration?

HEPA filtration is defined as the ability to remove 99.97% of particulate matter that is 0.3 microns in size and larger. This specification is particularly important because particles of this size represent the most penetrating particle size (MPPS), which means they are the hardest for filters to capture. Thus, to be classified as a HEPA filter, it must meet the standard that encompasses efficiency for particles at this challenging size and performs effectively for both larger and smaller particles.

This characteristic of HEPA filters makes them crucial in environments requiring high levels of air cleanliness, such as hospitals, laboratories, and areas undergoing microbial remediation. The efficiency rate provided ensures that a significant portion of airborne contaminants is captured, contributing to improved air quality and reduced health risks.