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What is HEPA filtration? HEPA (high-efficiency particulate air filtration) is a standard used by various high-quality air filtration systems. Let's now look at the basics of HEPA. How does HEPA filtration work? True HEPA filters use a special type of backing that is made up of randomly arranged fibers, usually made of fiberglass. Each individual fiber is extremely small, between 0.5 and 2.0 micrometers in width. As pollutants and contaminants are pushed through this filter, they become trapped between these fibers and cannot pass through. HEPA Filtration Standards The HEPA standards specify that any air filter must remove 99.97% of all particles that pass through it with a size greater than or equal to 0.3 µm. In effect, this removes almost all common airborne particles, including mold, ash, mold spores and pollen. What are HEPA filters used for? 

● Preventing the spread of bacteria in hospitals

● Keeping laboratory and production "clean rooms" dust free

● Filtration of recycled air in aircraft

● Air filtration in car cabins

● Cleaning the air after a fire or in a manufacturing plant

● HEPA filters are used by the vacuums that chimney sweeps use to clean flues and chimneys, to clean and capture extremely small particles of soot

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