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  2. HEPA - Wikipedia

    en.wikipedia.org/wiki/HEPA

    HEPA - Wikipedia ... HEPA

  3. Minimum efficiency reporting value - Wikipedia

    en.wikipedia.org/wiki/Minimum_Efficiency...

    Minimum efficiency reporting value

  4. Butterworth filter - Wikipedia

    en.wikipedia.org/wiki/Butterworth_filter

    Butterworth filter

  5. Wratten number - Wikipedia

    en.wikipedia.org/wiki/Wratten_number

    Wratten number. Wratten numbers are a labeling system for optical filters, usually for photographic use comprising a number sometimes followed by a letter. The number denotes the color of the filter and its spectral characteristics, and these numbers can be grouped into broad categories, but the numbering system is arbitrary within a group and ...

  6. Ultra-low particulate air - Wikipedia

    en.wikipedia.org/wiki/Ultra-low_particulate_air

    Ultra-low particulate air (ULPA) is a type of air filter. A ULPA filter can remove from the air at least 99.999% of dust, pollen, mold, bacteria and any airborne particles with a minimum particle penetration size of 120 nanometres (0.12 μm, ultrafine particles). A ULPA filter can remove—to a large extent but not 100%—oil smoke, tobacco ...

  7. Air changes per hour - Wikipedia

    en.wikipedia.org/wiki/Air_changes_per_hour

    Air changes per hour

  8. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    Multiplication table

  9. Filtration - Wikipedia

    en.wikipedia.org/wiki/Filtration

    Filtration - Wikipedia ... Filtration

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