Which filter removes most particulates from room air in containment environments?

• A. HEPA filter
• B. ULPA filter
• C. C-SEC
• D. CSCA

Answer: (A)

In containment environments, the filter’s job is to remove the vast majority of airborne particulates from room air while keeping airflow practical for the system. A HEPA filter is designed for this purpose and is the standard choice because it effectively captures most particles that pose a risk in typical containment settings. It provides high efficiency (about 99.97% of particles around the most penetrating size, roughly 0.3 microns) while maintaining manageable airflow and cost, which makes it suitable for widespread use and routine maintenance in many facilities.

While ultra-low particulate air (ULPA) filters offer higher efficiency (even more particles removed, down to smaller sizes), they come with higher pressure drops, greater energy use, and higher costs, and aren’t always necessary for standard containment needs. The other terms listed aren’t standard filter types for this purpose, so they don’t fit as the practical choice for removing particulates from room air in containment environments.

So, HEPA is the best fit because it achieves the right balance of high particulate removal and practical operation in typical containment settings.