Airborne transmission of coronavirus has made high-end air filtration systems more popular than 'toilet paper in April' as HVAC systems sell out

"You'll hear, and it's incorrect, 'oh, these viruses are too small to be filtered,' but that's not true. They're perfect. They're very easily filtered out," Kimberly Prather, an atmospheric chemist at the University of California at San Diego, said.

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