Those face masks with breathing valves? They aren't effective, doctors say
PHOENIX – Masks mandates are in place in cities across the country, and these mandates are increasingly banning the use of masks that have valves.
Though these one-way valves are designed to help provide more comfort by allowing air to escape the mask when users exhale, that function also allows the virus to spread.
"It defeats the purpose," said Kai Singbartl, a medical doctor who serves as the chair for infection prevention and control at the Mayo Clinic in Arizona. "They are unfiltered, those valves are the path of least resistance so to speak, it's easier to exhale and get rid of the heat and moisture."
But, in addition to exhaling heat and moisture, Singbartl said wearers are exhaling viral droplets and particles as well.
https://www.yahoo.com/news/those-face-masks-breathing-valves-200214481.html
Doesn't the dotard wear one of those?
