HEPA filters are composed of a mat of randomly arranged fibers. The fibers are typically composed of fiberglass and possess diameters between 0.5 and 2.0 micrometers. Key factors affecting function are fiber diameter, filter thickness, and face velocity. The air space between HEPA filter fibers is much greater than 0.3 μm.HEPA filter can be used if a patient has active tuberculosis as it also filters level PM2.5 pollutantsModern airliners use HEPA filters to reduce the spread of airborne pathogens in recirculated air

HESA Filter ( High Efficiency Specific Air-filter)

It’s positive pressure powered air-filter protective hood can prevent physicians and nurses from being infected by serious respiratory infections. The contaminated air filtered by the high efficiency specific air-filter (HESA) will then transported into the hood by a blower to form about 140 +/- 10 Pa positive pressure environment, which makes the air in hood overflow out from the lower part of the hood, by which carbon dioxide and vapor can be removed, and excreted. The HESA's filters of simulative virus up to 99.9999% with the structure of double layers filtering.

Philips AC4030 Purifier
Portable Virus Protector
in your car and on your desk