NPR

As We Return To Work And School During The Pandemic, Can The Air Inside Be Kept Safe?

Changes to ventilation — everything from opening windows to making pricey upgrades to HVAC systems — can help reduce the risk of the coronavirus being spread inside a building.
Mark Marston slides a MERV 13 air filter back into the HVAC system outside of Basics Fitness Center in Portland, Maine, on July 21. The gym bought these filters and made other changes to its ventilation, including bringing in more outside air, to help reduce the spread of the coronavirus.

Across America, buildings are opening back up — offices, schools, theaters, stores, restaurants — even as evidence mounts that the coronavirus can circulate through the air in a closed indoor space.

That means a lot of business owners and facility managers are calling up people like Dennis Knight, the founder of Whole Buildings Systems in Charleston, S.C., asking what they can do to make sure building doesn't spread the

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