HEPA (high efficiency particulate air) filters are a type of air filter used in the cleanroom industry and other industries with clean air requirement.
HEPA filters are created from a mesh of fibers that are composed randomly, and as air is passed through it, it acts like a sieve, removing particles from the air. The effectiveness of the HEPA filter depends on several attributes: thickness, fiber density and diameter. HEPA filters can remove 99.97% of the 0.3 µm particles, with the assumption that these size of particles will be unable to find a path through the thick mesh of fiber and will become trapped.
