https://www.brighteon.com/8d66edd7-d09a-45a8-a3b4-8ccac14f9d37 

26:32 Talks about this

Quoting CDC PAGE with link given

  • Not everyone is able to wear a respirator due to medical conditions that may be made worse when breathing through a respirator. Before using a respirator or getting fit-tested, workers must have a medical evaluation to make sure that they are able to wear a respirator safely.

An N95 respirator with an exhalation valve does provide the same level of protection to the wearer as one that does not have a valve. The presence of an exhalation valve reduces exhalation resistance, which makes it easier to breathe (exhale). Some users feel that a respirator with an exhalation valve keeps the face cooler and reduces moisture build up inside the facepiece. However, respirators with exhalation valves should not be used in situations where a sterile field must be maintained (e.g., during an invasive procedure in an operating or procedure room) because the exhalation valve allows unfiltered exhaled air to escape into the sterile field.

Source: https://www.cdc.gov/coronavirus/2019-ncov/hcp/respirator-use-faq.html

Commentary that the claim is you are protecting others wearing the top of the line mask, but the CDC admits it releases it all. And the surgical masks are not considered respiratory protection according to the chart on their site.

Test with meter on students

8 minutes in students test with oxygen meter

https://www.brighteon.com/f707f9ff-5ece-48d8-8ae8-3f2c4ff3d53d

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