1. What is a HEPA filter?
High Efficiency Particulate Air Filter (HEPA) is a technology developed by the American Atomic Energy Commission (DoE) during the 1940s for the purpose of providing a method for efficient filtering of particle accelerators. radioactive waste, and products using this technology have been marketed since 1953.
2. Principle of operation:
Basically, the HEPA filter is composed of a grid of randomly arranged fibers. The filaments generally consist of glass fibers and have a diameter of 0.5 to 2.0 microns, so the filter can trap a large number of very small particles, potentially causing asthma and respiratory allergies. The canister can not be vacuumed by any other vacuum cleaner. Typically, vacuum cleaners without HEPA filters will emit such small dust particles back into the indoor air.
HEPA filters can filter most of the substances from the air, as small as 0.3 mm in size. They are useful for filtering pollen, fungal spores, fur and smoke. According to the WebMD medical news website reported by researchers from Queensland University of Technology (Brisbane, Australia), the HEPA filter is said to remove 99.9 percent of pollen, animal hair and even bacteria from the air.
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