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2. The 10 Best N95 Masks on Amazon, Plus 4 Top-Rated KN95s - AOL

   www.aol.com/lifestyle/10-best-n95-masks-amazon...

   Best N95 Surgical Mask: Honeywell Surgical N95 Respirator. Most Breathable N95 Mask: BNX N95 Mask. Best-Fitting N95 Mask: Benehal N95 Mask. Best N95 Protective Mask: 3M 8210 Particular Respirator ...

3. Respirator - Wikipedia

   en.wikipedia.org/wiki/Respirator

   In 1848, the first US patent for an air-purifying respirator was granted to Lewis P. Haslett [5] for his 'Haslett's Lung Protector,' which filtered dust from the air using one-way clapper valves and a filter made of moistened wool or a similar porous substance. [6] Hutson Hurd patented a cup-shaped mask in 1879 which became widespread in ...

4. N95 respirator - Wikipedia

   en.wikipedia.org/wiki/N95_respirator

   An N95 respirator is a disposable filtering facepiece respirator or reusable elastomeric respirator filter that meets the U.S. National Institute for Occupational Safety and Health (NIOSH) N95 standard of air filtration, filtering at least 95% of airborne particles that have a mass median aerodynamic diameter of 0.3 micrometers under 42 CFR 84, effective July 10, 1995.

5. Mechanical filter (respirator) - Wikipedia

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

   According to 3M, respirators made according to the following standards are equivalent to US N95 or European FFP2 respirators "for filtering non-oil-based particles such as those resulting from wildfires, PM 2.5 air pollution, volcanic eruptions, or bioaerosols (e.g. viruses)": [40] Chinese KN95 (GB2626-2006): similar to US.

6. These KN95 and N95 Face Masks Help Protect Against the Flu ...

   www.aol.com/kn95-n95-face-masks-help-182200553.html

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7. Self-contained breathing apparatus - Wikipedia

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

   Demand: 2000 psi to the regulator from the main valve, plus a bypass valve in case of failure, with a two-stage regulator reducing pressure to 50-100 psi. Pressure-Demand : Similar to demand, but with a spring in the diaphragm, which holds the admission valve open, for continuous air flow to the facepiece.