Older buildings need innovative retrofit solutions to improve indoor air quality. This study showed that a low-cost unit, made of a simple box fan with a MERV13 filter taped to it may perform as well at removing particles from a room as a high-cost HEPA filter unit.
University of Maryland faculty and students are building and distributing cost-effective air filtration Corsi-Rosenthal boxes.
"There shouldn’t be anything controversial about clean air. These devices (CR Box Filters) facilitate that. They provide an additional layer of protection that could be widely deployed to make our K-12 and university indoor spaces healthier.”
Masks and testing are necessary to combat asymptomatic spread in aerosols and droplets
