What percentage of airborne particulate does High Efficiency Particulate Air (HEPA) filtration filter out?

High Efficiency Particulate Air (HEPA) filters are designed to meet stringent standards for air filtration, specifically targeting particulate matter. These filters are capable of capturing at least 99.97% of airborne particles that are 0.3 microns in diameter. This is a critical measurement because 0.3 microns represents the most penetrating particle size, meaning that particles of this size are the hardest for a filter to capture.

The effectiveness of HEPA filters in removing such a high percentage of very small particles contributes significantly to improving indoor air quality, especially in environments where mold, dust, allergens, and other airborne pollutants are a concern. This characteristic makes HEPA filters a preferred choice in various applications, including healthcare facilities, homes, and any environment needing clean air standards.

The other options do not reflect the standard HEPA filtration capabilities. For instance, while a percentage of 95.50% is effective, it does not meet the HEPA standard. Similarly, capturing 89.10% or filtering out 100% of airborne particles is not practical, as no filter can realistically achieve complete filtration without some form of bypass. Thus, 99.97% accurately reflects the high efficiency of HEPA filtration technology, reaffirming its