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2. 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 ...

3. Elastomeric respirator - Wikipedia

   en.wikipedia.org/wiki/Elastomeric_respirator

   Air-purifying respirators like elastomeric respirators are somewhat less protective than some air-supplying respirators. [5] A powered air-purifying respirator is an elastomeric mask with a battery-powered fan to force air in (except loose-fitting PAPRs) Chemical cartridge for chemical filters used with elastomeric respirators

4. 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.

5. Mechanical filter (respirator) - Wikipedia

   en.wikipedia.org/wiki/Mechanical_filter_(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 ...

6. NIOSH air filtration rating - Wikipedia

   en.wikipedia.org/wiki/NIOSH_air_filtration_rating

   Prior to the approval of 42 CFR 84, MSHA and NIOSH approved respirators under 30 CFR 11. Non-powered respirator filters were classified based on their design against a contaminant, including substances like Dusts, Fumes, Mists, radionuclides, and asbestos. Dust/Mist was usually tested with silica, and Fume was usually tested with lead fume.

7. 3M - Wikipedia

   en.wikipedia.org/wiki/3M

   The N95 respirator mask was developed by 3M and approved in 1972. [114] Due to its ability to filter viral particulates, its use was recommended during the COVID-19 pandemic but supply soon became short. [ 114 ]