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2. Where to find NIOSH-approved N95 masks right now - AOL

   www.aol.com/news/where-niosh-approved-n95-masks...

   DemeTECH N95 Respirator $65.00 at Amazon. DemeTECH N95 Respirator $75.00 at DemeTECH. 3M Aura N95 Respirator . 3M’s Aura N95 Respirator is available in a pack of three, 10 or 20. It comprises a ...

3. 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.

4. 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] Much of the company's supply had already been sold prior to the outbreak. [115]

5. 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 ...

6. The 7 Best Places to Buy N95, KN95 and KF94 Face Masks for ...

   www.aol.com/8-best-places-buy-n95-203000418.html

   1. Vida Kids Mask with KN95 Protection. These USA-made kids’ masks feature a five-layer filtration system and a 95 to 99 percent efficiency, per Vida’s website. (And according to Collins ...

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.