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  2. Media filter - Wikipedia

    en.wikipedia.org/wiki/Media_filter

    A media filter is a type of filter that uses a bed of sand, peat, shredded tires, foam, crushed glass, geo-textile fabric, anthracite, crushed granite or other material to filter water for drinking, swimming pools, aquaculture, irrigation, stormwater management, oil and gas operations, and other applications. Each layer of media is designed to ...

  3. HEPA - Wikipedia

    en.wikipedia.org/wiki/HEPA

    HEPA filters, as defined by the United States Department of Energy (DOE) standard adopted by most American industries, remove at least 99.97% of aerosols 0.3 micrometers (μm) in diameter. [24] The filter's minimal resistance to airflow, or pressure drop, is usually specified around 300 pascals (0.044 psi) at its nominal volumetric flow rate. [7]

  4. NIOSH air filtration rating - Wikipedia

    en.wikipedia.org/wiki/NIOSH_air_filtration_rating

    The NIOSH air filtration rating is the U.S. National Institute for Occupational Safety and Health (NIOSH)'s classification of filtering respirators. The ratings describe the ability of the device to protect the wearer from solid and liquid particulates in the air. The certification and approval process for respiratory protective devices is ...

  5. Internet censorship in the United States - Wikipedia

    en.wikipedia.org/wiki/Internet_censorship_in_the...

    yo Internet censorship in the United States is the suppression of information published or viewed on the Internet in the United States. The First Amendment of the United States Constitution protects freedom of speech and expression against federal, state, and local government censorship. Free speech protections allow little government-mandated ...

  6. Pile Cloth Media Filtration - Wikipedia

    en.wikipedia.org/wiki/Pile_Cloth_Media_Filtration

    Pile Cloth Media Filtration is a mechanical process for the separation of organic and inorganic solids from liquids. It belongs to the processes of surface filtration and cake filtration where, in addition to the sieve effect, real filtration effects occur over the depth of the pile layer. [ 1][ 2][ 3] Pile Cloth Media Filtration represents a ...

  7. Air filtration in operating rooms - Wikipedia

    en.wikipedia.org/wiki/Air_filtration_in...

    Air filtration guidelines for operating rooms are determined by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) using a standard known as Minimum Efficiency Reporting Value (MERV). MERV is determined based on the size of particles successfully removed from the air and is used to classify the efficiency of ...

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