Tests in university classes show that simple, low-cost systems can remove airborne particles with little disruption from fan noise.
Tests in university classes show that simple, low-cost systems can remove airborne particles with little disruption from fan noise.
As students return to school and cold and flu season begins, researchers are studying ways to improve indoor air quality and reduce the risk of airborne disease transmission. A study in ACS ES&T Air reports test results of do-it-yourself (DIY) air filters, known as Corsi-Rosenthal Boxes, in university class sessions. The units reduced particulate matter across the occupied classroom by 61%, produced minimal noise, and were more affordable than commercial portable air purifiers.
“Corsi-Rosenthal Boxes are a safe, highly effective tool for improving indoor air quality without disrupting the learning environment.” – Misti Zamora
Read More: American Chemical Society
Image: A C-R Box is made from a standard box fan, four high-efficiency filters, two pieces of cardboard, and tape, creating a device that can improve air quality in active classrooms. (Credit: Adapted from ACS ES&T Air 2026, DOI: 10.1021/acsestair.6c00143)
