These are known as one-way valves, with the filter functional only in one direction. As you inhale, the incoming air is filtered. As you exhale, the outgoing mixture of carbon dioxide, oxygen, water vapor and, yes, possibly COVID-19 viral particles releases unfiltered. The San Francisco Department of Public Health actually tweeted a warning that these masks “may actually propel your germs further.” It prohibited them in its original public health order requiring masks or other face covering during the pandemi
Before COVID-19, people would buy these masks for DIY projects like installing fiberglass insulation, sweeping a dusty garage, sanding an old bookcase or removing mildew or efflorescence — a white, powdery substance — from basement walls. A valveless N95 became a coveted personal protective equipment for healthcare professionals during the pandemic. A valved N95 mask became a potential menace.
They should not be used, says the CDC, “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.”
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