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2. NIOSH air filtration rating - Wikipedia

   en.wikipedia.org/wiki/NIOSH_air_filtration_rating

   Person wearing purple 3M 7093 P100 cartridge filters. For particulate respirators, while NIOSH designates P100 as filter cartridges that can use the "magenta" color, ANSI designates P100 as "purple", a color which can be seen on some P100 filter cartridges.

3. File:Methods for the timely replacement of cartridges in ...

   en.wikipedia.org/wiki/File:Methods_for_the...

   Short title: Methods for the timely replacement of cartridges in respirators; Date and time of digitizing: 15:10, 22 June 2015: Software used: LaTeX with hyperref package

4. Chemical cartridge - Wikipedia

   en.wikipedia.org/wiki/Chemical_cartridge

   Workplace air that is polluted with fine particulate matter or noxious gases but that contains enough oxygen (in the US, this is ruled to be a concentration above 19.5%; in the Russian Federation, above 18% [citation needed]), can be rendered safe via air-purifying respirators. Cartridges are of different types, and must be chosen correctly and ...

5. Powered air-purifying respirator - Wikipedia

   en.wikipedia.org/wiki/Powered_air-purifying...

   A powered air-purifying respirator (PAPR) is a type of respirator used to safeguard workers against contaminated air. PAPRs consist of a headgear-and-fan assembly that takes ambient air contaminated with one or more type of pollutant or pathogen , actively removes (filters) a sufficient proportion of these hazards, and then delivers the clean ...

6. European respirator standards - Wikipedia

   en.wikipedia.org/wiki/European_respirator_standards

   EN 14683 defines respirators for use in medical settings, [4] while European standard EN 143 defines the 'P' classes of particle filters that can be attached to a face mask, which are P1, P2, and P3. The EN 143 filters are typically used on reusable respirators, like elastomeric respirators. [5] EN 14387 is the chemical cartridge standard in ...

7. Passengers experienced ‘hard jolt,’ then ‘free fall’ on ...

   www.aol.com/passengers-experienced-hard-jolt...

   Passengers experienced ‘hard jolt,’ then ‘free fall’ on turbulent flight. Investigators point finger at pilots