What is a characteristic of high-efficiency particulate air (HEPA) filters?

High-efficiency particulate air (HEPA) filters are recognized for their ability to effectively trap particulate matter. The defining characteristic of HEPA filters is their capability to capture 99.97% of airborne particles that are 0.3 micrometers in diameter. This size is particularly significant because it represents the most penetrating particle size (MPPS), meaning that particles of this size present the greatest challenge for filtration. By efficiently trapping these small particles, HEPA filters are ideal for environments requiring strict air quality standards, such as laboratories, hospitals, and areas where asbestos abatement is taking place.

The effectiveness of HEPA filters extends to a broad range of particles, including allergens, dust, and even some types of bacteria and viruses. Thus, they are not limited to filtering only specific types of contaminants, such as biological materials, which underscores their versatility in various applications.