Particle Size - HEPA Filters

HEPA is short for, High Efficiency Particle Air

HEPA Filters are a specific type of pleated mechanical ‘exhausted air’ filter.

They are designed to filter exhausted air dust-particulates to at least 3 microns (µ)
HEPA H13 trap 99.95% -  HEPA  H14 trap 99.95%,  of such particles.

Manufactured to EN 1822, so you would be installing technology that is tested and approved, 
ensuring reliability of the filter to remove very, very small carcinogenic airborne particles