![]() ![]() “It’s really quite impressive compared to a lot of the commercial filters on the market,” says Chris Cappa, PhD, a UC-Davis professor and researcher who worked with Corsi to study how well the Corsi-Rosenthal box performed. (Corsi was one of the researchers involved in this study.) The researchers also said the “cost per air unit cleaned” was about a tenth of that of a HEPA air cleaner. That means it could clean the air in the rooms much more quickly. At the same time, concentrations of phthalates (from personal-care products and building materials) went down 30%-60%.Īnother small study involving 2 rooms found that the clean air delivery rate (CADR) of the Corsi-Rosenthal box was significantly better than that of the HEPA filter it was compared to. In the 2-month period when the boxes were used, concentrations of certain PFAS (chemicals found in cleaning products and textiles) went down by 40%-60%. One study looked at how well Corsi-Rosenthal boxes removed chemicals from the air in an academic building at Brown University. Just like that, the Corsi-Rosenthal box was born. Once Rosenthal heard about Corsi’s device, he built the first one. The higher the MERV, the more effective the filter.) But not with MERV 13 filters.” (MERV, or minimum efficiency reporting values, is a measure of how well a filter captures particles. “It wasn't an original idea – people had put a single filter on a box fan before. “One night, I just scribbled out this idea on a piece of paper,” says Corsi, who is dean of the College of Engineering at the University of California-Davis. ![]() Experts say they could offer a simple solution to improve air quality in our homes, classrooms, and workplaces, which aren’t always well-ventilated. ![]() Some early research suggests these DIY air cleaners, made from cardboard, tape, furnace filters, and a box fan, might be more effective in some ways than HEPA purifiers. Richard Corsi, PhD, of the University of California-Davis and Jim Rosenthal, CEO of Tex-Air Filters, have created a type of homemade air filter that costs less than a third of the price of many HEPA devices. But quality air purifiers, like HEPA machines, can be pricey. A good filtration system can help protect you and your family from allergens, indoor pollutants like smoke, and viruses like COVID-19. Indoor air quality is important, since Americans spend most of their lives inside. ![]()
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