KN95 masks (also known as KN95 Respirators) are a type of filtering facepiece respirator that are commonly made and used in China.
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KN95 masks may be preferable in some situations or for some people – especially for situations that require prolonged close contact with people who do not live in the same household, or for people who are at increased risk for severe illness from COVID-19.
What to look for:
Look for KN95 masks that meet requirements similar to those set by CDC’s National Institute for Occupational Safety and Health (NIOSH) for respirators.
Features:
Often have ear loops that fit behind the ears. However, some available options have head straps.
Note: Do NOT wear KN95 masks with exhalation valves since they allow respiratory droplets containing the virus to escape.
Pros: Filter up to 95% of particles in the air (when they meet the right requirements and are not counterfeit/fake, and when proper fit can be achieved).
Cons: Can be uncomfortable; designed for one-time use; many counterfeit (fake) KN95 masks are commercially available, and sometimes it is hard to tell if they meet the right requirements just by looking at them. At least 60% of the KN95 masks evaluated by NIOSH did not meet the requirements that they claim to meet.
Source: https://www.cdc.gov/ (USA)