A HEPA filter removes particles that are _________ in diameter or larger.

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Multiple Choice

A HEPA filter removes particles that are _________ in diameter or larger.

Explanation:
HEPA efficiency curves show a minimum performance at around 0.3 microns, known as the most penetrating particle size. Certification tests for HEPA filters are performed at this size, and a properly functioning filter is rated to remove at least 99.97% of particles that are 0.3 microns in diameter or larger. For larger particles, impaction and interception make capture even more effective, while smaller particles are captured well by diffusion, but the standard uses 0.3 microns as the benchmark. So saying 0.3 microns or larger reflects the tested and guaranteed performance threshold of HEPA filtration.

HEPA efficiency curves show a minimum performance at around 0.3 microns, known as the most penetrating particle size. Certification tests for HEPA filters are performed at this size, and a properly functioning filter is rated to remove at least 99.97% of particles that are 0.3 microns in diameter or larger. For larger particles, impaction and interception make capture even more effective, while smaller particles are captured well by diffusion, but the standard uses 0.3 microns as the benchmark. So saying 0.3 microns or larger reflects the tested and guaranteed performance threshold of HEPA filtration.

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