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2. European respirator standards - Wikipedia

   en.wikipedia.org/wiki/European_respirator_standards

   R (reusable): if the filtering half-face mask can be used for more than one working day, so it is reusable. Additional suffixes include: Anti-clogging NR masks (D). When the half mask has passed the dolomite dust test, a letter D can be added to indicate that the service life may exceed 8 h. [14] Example: FFP3 NR D. Valve.

3. Dust mask - Wikipedia

   en.wikipedia.org/wiki/Dust_mask

   [2] [3] The European FFP1 mask, the lowest-grade standard available in the jurisdiction, is an example of a dust mask, being only certified to remove ~80% of dusts and mists. [ 4 ] Dust masks are used in environments with dusts encountered during construction or cleaning activities, biological hazards from farming , [ 1 ] or sweeping .

4. Mechanical filter (respirator) - Wikipedia

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

   Mid-size particles follow flowlines and are more likely to get through the filter; the hardest size to filter is 0.3 microns diameter. [2] Filter mechanisms. Mechanical filter respirators retain particulate matter such as dust created during woodworking or metal processing, when contaminated air is passed through the filter material. Wool is ...

5. Respirator - Wikipedia

   en.wikipedia.org/wiki/Respirator

   Air-purifying respirators range from relatively inexpensive, single-use, disposable face masks, known as filtering facepiece respirators, reusable models with replaceable cartridges called elastomeric respirators, to powered air-purifying respirators (PAPR), which use a pump or fan to constantly move air through a filter and supply purified air ...

6. NIOSH air filtration rating - Wikipedia

   en.wikipedia.org/wiki/NIOSH_air_filtration_rating

   During the COVID-19 pandemic, the mask and respirator market rapidly grew, along with counterfeit respirators. [1] NIOSH, on behalf of the Department of Health and Human Services, filed a trademark application on June 17, 2020, for various 42 CFR 84 trademarks, including the N95, allowing NIOSH to enforce rules on counterfeit masks outside of rules defined in 42 CFR 84.

7. Nose filter - Wikipedia

   en.wikipedia.org/wiki/Nose_filter

   Three disposable nose filters. A nose filter or nasal filter is an air filter designed to fit inside the human nostrils to prevent the nasal inhalation of allergens, [1] pollutants, and irritants such as dust, smoke, and foul odors.