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  2. NIOSH air filtration rating - Wikipedia

    en.wikipedia.org/wiki/NIOSH_air_filtration_rating

    A comparison table below details the NIOSH protection designations, [36] 42 CFR 84, [21] the Navy/Marine Field Manual, [38] the NIOSH TB guide, [25] and whether they match up with the groups of NIOSH protection designations, per color, in the 42 CFR 84-declared ANSI K13.1-1973 revision ANSI Z88.7-2001, [37] for each type of chemical cartridge ...

  3. Rheem Manufacturing Company - Wikipedia

    en.wikipedia.org/wiki/Rheem_Manufacturing_Company

    Website. www.rheem.com. Rheem Manufacturing Company is an American privately held manufacturer that produces residential and commercial water heaters and boilers, as well as heating, ventilating and air conditioning (HVAC) equipment. The company also produces and sells products under the Ruud brand name.

  4. 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 ...

  5. .45 ACP - Wikipedia

    en.wikipedia.org/wiki/.45_ACP

    2,036 ft/s (621 m/s) 829 ft⋅lbf (1,124 J) The .45 ACP (Automatic Colt Pistol), also known as .45 Auto, .45 Automatic, or 11.43×23mm[1] is a rimless straight-walled handgun cartridge designed by John Moses Browning in 1904, for use in his prototype Colt semi-automatic pistol.

  6. Friedrich Air Conditioning - Wikipedia

    en.wikipedia.org/wiki/Friedrich_Air_Conditioning

    Chuck Campbell, President. Number of employees. 194. Parent. Rheem. Website. friedrich.com. Friedrich Air Conditioning is an American privately held company that manufactures commercial-grade room air conditioners and specialty cooling products for residential and light commercial applications. The company is based in Uptown, San Antonio, Texas.

  7. Cross-flow filtration - Wikipedia

    en.wikipedia.org/wiki/Cross-flow_filtration

    In chemical engineering, biochemical engineering and protein purification, cross-flow filtration[1] (also known as tangential flow filtration[2]) is a type of filtration (a particular unit operation). Cross-flow filtration is different from dead-end filtration in which the feed is passed through a membrane or bed, the solids being trapped in ...

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