HEPA ULPA filter medium separates solid particles liquid droplets from fluid passing through it

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Filter Medium

A Permeable material that separates solid particles or liquid droplets from a fluid passing through it. Two types are defined as

HEPA (High Efficiency Particulate Air) Filter Medium
A filter medium having a maximum particle penetration of 0.03% on 0.3µm particles

ULPA ( Ultra Low Penetration Air) Filter Medium
A filter medium having maximum particle penetration of 0.001% for particles of the most penetrating size ) typically 0.1 to 0.2µm at the specified velocity