Which statement best describes a HEPA filter?

Which statement best describes a HEPA filter?

• A. High-Efficiency Particulate Air
• B. Heavy Emission Particulate Air
• C. Helium Enhanced Particulate Air
• D. Hyper-Effective Particle Air

Answer: (A)

A HEPA filter is a filter designed to remove a very high percentage of airborne particles. The acronym stands for High-Efficiency Particulate Air, which directly communicates both the high efficiency and its focus on particulates in the air. In practice, HEPA filters capture at least about 99.97% of particles that are around 0.3 microns in diameter, and they also trap larger and many smaller particles. They work through a combination of mechanisms—impaction, interception, and diffusion (Brownian motion)—so they’re effective across a range of particle sizes. This combination of high efficiency and particulate focus is what defines a HEPA filter and sets it apart from the other, nonstandard phrasing options.

A HEPA filter is a filter designed to remove a very high percentage of airborne particles. The acronym stands for High-Efficiency Particulate Air, which directly communicates both the high efficiency and its focus on particulates in the air. In practice, HEPA filters capture at least about 99.97% of particles that are around 0.3 microns in diameter, and they also trap larger and many smaller particles. They work through a combination of mechanisms—impaction, interception, and diffusion (Brownian motion)—so they’re effective across a range of particle sizes. This combination of high efficiency and particulate focus is what defines a HEPA filter and sets it apart from the other, nonstandard phrasing options.