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2. M50 Joint Service General Purpose Mask - Wikipedia

   en.wikipedia.org/wiki/Joint_Service_General...

   The mask was designed to incorporate state-of-the-art technology to protect soldiers from current and anticipated threats from all types of weapons of mass destruction. It is an above-the-neck, chemical - biological (CB) respirator that protects against battlefield concentrations of CB agents, toxins , toxic industrial materials, and ...

3. Respirator - Wikipedia

   en.wikipedia.org/wiki/Respirator

   The fitting characteristic of a respirator is the ability of the mask to separate a worker's respiratory system from ambient air. This is achieved by tightly pressing the mask flush against the face (without gaps) to ensure an efficient seal on the mask perimeter.

4. Powered air-purifying respirator - Wikipedia

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

   The mask may be hard and tight-fitting, or flexible and loose-fitting. The former affords a higher level of protection, but is less comfortable. [ 2 ] Tight-fitting PAPRs require a fit test in hazardous workplace environments, while loose-fitting PAPR users can avoid OSHA fit test requirements in certain hazardous workplace environments (see ...

5. Escape breathing apparatus - Wikipedia

   en.wikipedia.org/wiki/Escape_breathing_apparatus

   Polish Au-2 escape respirator. Escape breathing apparatus, also called escape respirators, escape sets, self-rescuer masks, emergency life saving apparatus (ELSA), emergency escape breathing devices (EEBD), and Respiratory Protective Smoke Escape Devices (RPED), [1] [2] are portable breathing apparatus that provide the wearer with respiratory protection for a limited period, intended for ...

6. Elastomeric respirator - Wikipedia

   en.wikipedia.org/wiki/Elastomeric_respirator

   Elastomeric masks must be individually fit-tested and inspected for full efficacy. [2] They may be somewhat easier to fit than filtering facepiece respirators. Older mask designs were designed only to fit young adult men of average weight and a narrow range of ethnicities; newer ones use updated anthropometry and fit more people. [5]

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