The Corsi–Rosenthal Box is a design for a do-it-yourself air purifier that can be built comparatively inexpensively. It consists of four
or five HVAC particulate air filters that form a cube and a box fan to draw air through the filters. The seams of the cube are sealed with duct tape. A 2022 study found the clean air delivery rate on the five-filter design was between 600 and 850 cubic feet per minute (depending on fan speed), costing roughly a tenth of commercial air filters. Engineers Richard Corsi and Jim Rosenthal created the design during the COVID-19 pandemic, with the goal of reducing the risk of infection by reducing the levels of airborne viral particles in indoor settings.
Background and history
COVID-19 is primarily transmitted through the air and superspreading events are generally associated with indoor gatherings where the virus is allowed to accumulate in the air. In response, and on recommendations of infectious disease researchers, engineers began to consider how improved ventilation may reduce risk of infection by reducing the amount of virus in indoor air.
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