What type of fibers do HEPA filters capture?

HEPA (High-Efficiency Particulate Air) filters are designed to capture very small particles, including harmful substances like asbestos fibers, which are typically less than 0.3 microns in size. These filters can trap at least 99.97% of particulate matter that is 0.3 microns in diameter, making them highly effective for air purification in environments where hazardous substances, such as asbestos, may be present.

The ability of HEPA filters to remove very small fibers makes them critical in asbestos abatement and other health-sensitive applications. This capacity not only helps in maintaining air quality but also ensures a safer environment for workers and residents in areas where asbestos exposure could occur. Thus, the focus is on their efficacy against small, harmful particulates, aligning perfectly with the choice highlighting their role in capturing very small particles, including asbestos.