HEPA filters will remove 99.995% of their most penetrating particles. Whereas ULPA filters remove 99.999% of their most penetrating particles. While both filters are highly efficient, ULPA filters offer slightly increased protection against particles contamination. HEPA filters can help you maintain an ISO Class 5 Standard Cleanroom.

Both filters use layers of dense fibers to create a fine mesh filter that removes contaminants as air is forced through them. Both HEPA and ULPA filters use a combination of three main methods to trap contaminants: diffusion, interception, and inertial impaction. ULPA filters trap more and smaller particulate matter than HEPA filters.

HEPA filters are most common filtration used for cleanrooms. ULPA filters are denser meaning they allow less particles to get thru the filter and catch smaller particles. HEPA filters catch 99.97% of particles at 0.3u. ULPA filters catch 99.999% of particles at 0.12u.