KN95s and
N95s, on the other hand, are respirators. While a cloth face mask might allow some gaps—such as at the bridge of the nose or near the cheeks—respirators, McCullough says, should seal completely to the skin.
These respirators filter out 95 percent of particles that are 0.3 microns or larger in diameter, explains Dr. Michael Schivo, a pulmonologist and an associate professor of internal medicine at UC Davis Health.
“That’s important because most bacteria are larger than 0.3 microns,” he says. “
Many virus particles are small, and some are smaller than 0.3 microns, but they’re suspended in water droplets that make them effectively bigger. So these masks filter out 95 percent of those small particles.”
And the interesting difference between them.
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