What is the role of HEPA filtration in asbestos control?

• A. HEPA filtration captures at least 99.97% of 0.3-micron particles, preventing fiber escape in exhaust air and within containment.
• B. HEPA filtration removes odors only.
• C. HEPA filtration reduces noise.
• D. HEPA filtration is used only for water systems.

Answer: (B)

HEPA filtration is about trapping tiny airborne particles, including asbestos fibers, so they don’t escape containment or reach exhaust air. A HEPA filter is rated to capture at least 99.97% of particles at 0.3 microns. That 0.3-micron size is the most penetrating size, so filters that meet this spec are effective across a range of particle sizes: they capture many even smaller fibers and larger particles through diffusion, impaction, and interception. In asbestos control, HEPA filters are used on vacuums, air cleaners, and airflow paths to keep air within containment clean and to prevent fibers from leaving the work area. This role is about particle removal, not odors. Odor control requires other technologies, like activated carbon, and HEPA is not designed for that purpose.