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air filter - wikipedia

a particulate air filter is a device composed of fibrous materials which removes solid particulates such as dust pollen mould and bacteria from the air

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hepa filters and ulpa filters information engineering

high-efficiency particulate air hepa filters and ultra-low particulate air ulpa filters are designed to screen particles larger than 0

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hepa - wikipedia

many vacuum cleaners also use hepa filters as part of their filtration systems this is beneficial for asthma and allergy sufferers because the hepa filter traps the

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