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  2. Respirator assigned protection factors - Wikipedia

    en.wikipedia.org/wiki/Respirator_Assigned...

    Source [26] Negative pressure full face mask. APF decreased from 900 to 40 after PF studies in the workplace. Negative pressure full face masks; Measurement of protection factors of negative pressure full face masks with high-efficiency filters in the laboratory revealed a risk of decrease in protective properties to a small values. [27]

  3. Respirator - Wikipedia

    en.wikipedia.org/wiki/Respirator

    A full facepiece covers the mouth, nose and eyes and if sealed, is sealed round the perimeter of the face. Unsealed versions may be used when air is supplied at a rate which prevents ambient gas from reaching the nose or mouth during inhalation. Respirators can have half-face forms that cover the bottom half of the face including the nose and ...

  4. Siebe Gorman Proto - Wikipedia

    en.wikipedia.org/wiki/Siebe_Gorman_Proto

    These sets were used in the London fire brigade from the 1950s till the early to late 1970s, when these rebreathers were replaced by compressed air sets which use a cylinder strapped to the back of the firefighter and the air fed through a hose to the firefighter's full face mask: this is their current type of breathing apparatus.

  5. Self-contained breathing apparatus - Wikipedia

    en.wikipedia.org/wiki/Self-contained_breathing...

    An open-circuit rescue or firefighting SCBA has a full-face mask, also called the face-piece, a demand regulator, air cylinder, pressure gauge, (sometimes with an integrated PASS device), and a harness with adjustable shoulder straps and waist belt which lets it be worn on the back. The air cylinder is commonly 4 liter, 6 liter, or 6.8 liter ...

  6. 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 ...

  7. Respirator fit test - Wikipedia

    en.wikipedia.org/wiki/Respirator_fit_test

    U.S. law requires employers to offer employees a mask with large enough fit factor. For half face-piece masks (used when the concentration of harmful substances is not more than 10 PEL), the fit factor should not be less than 100; and for full face masks (not more than 50 PEL), the fit factor should not be less than 500. The safety factor of 10 ...

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