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UConn students built an air purifier out of furnace filters, a fan and duct tape and it traps COVID-19 virus. Here's how they did it. – Hartford Courant
A simple filter built from four furnace-type filters and a box fan can take the coronavirus and other pollutants out of the air, and can be used as a school project. They cost about $65 each and are being distributed to schools.
Source: courant.com