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2. Powered air-purifying respirator - Wikipedia

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

   A PAPR, gown, and biosafety cabinet in use in a BSL-3 laboratory. All parts of the PAPR are visible: the waist unit holding the fan, filter, and battery; the hose; and the mask, in this case a flexible, loose-fitting one. A powered air-purifying respirator (PAPR) is a type of respirator used to safeguard workers against contaminated air.

3. Respirator - Wikipedia

   en.wikipedia.org/wiki/Respirator

   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 ...

4. Respirator assigned protection factors - Wikipedia

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

   Measurement of workplace protection factors surprisingly revealed the low efficiency of some designs of respirators, and that results have led to a sharp tightening of the requirements for application limits for respirators of such designs. PAPR with hood. APF decreased from 1000 to 25 after PF studies in the workplaces. PAPR with helmets or hoods

5. Glossary of breathing apparatus terminology - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_breathing...

   A powered air-purifying respirator (PAPR) is a type of respirator that consists of a headgear-and-fan assembly that passes ambient air through purifying units that remove contaminants and deliver clean air to the inside of the headgear covering the user's face or mouth and nose. Also known as positive-pressure masks, blower units, or just blowers.

6. Racal suit - Wikipedia

   en.wikipedia.org/wiki/Racal_suit

   The hood is a separate component from the protective suit. The Racal hood is a type of PAPR consisting of a transparent hood connected to a respirator, which is powered by a rechargeable battery. The respirator has three HEPA filters that are certified to remove 99.7% of particles of 0.03 to 3.0 microns in diameter.

7. NIOSH air filtration rating - Wikipedia

   en.wikipedia.org/wiki/NIOSH_air_filtration_rating

   The CEL was initially released in paper form on September 30, 1993. However, due to low usage of the paper CEL, as well as the increasing number of respirators approved by NIOSH, a Microsoft Access-based version of the CEL was released. [29] Initial releases of the CEL had hose and pressure information for air-line respirators. This information ...