• Video footage captured by a drone at UConn Health.

The Power of Cross-Campus Collaboration

UConn Schools of Education, Engineering, Nursing, Medicine and UConn Health are connecting our communities to low-cost, accessible public health interventions to reduce the risk of COVID-19 and other respiratory diseases

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stop the spread
Image by Amanda Hu, licensed under Creative Commons

What We Have Learned

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CR Box Real-world Feasibility, Research and Efficacy Study


See the Studies

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Undergraduate STEM Curriculum and Builds and Deployment


Our Curriculum

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Study of CR Box Impact in major practical Real World Settings


Boxes in Action

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CR Accessibility for All With Our Informational Website & STEM Lesson Plans


Build Your Own

Testing the Efficacy of the “Corsi-Rosenthal” Box Fan Filter in an Active Classroom Environment

Graphical Abstract with air filter

Poor ventilation in classrooms can increase the risk of infectious disease transmission, such as COVID-19, because it allows respiratory aerosol particles that may contain viruses to accumulate. Air purifiers can effectively reduce transmission rates in community spaces, including classrooms, because they increase the air change rate in the room and reduce particle concentrations. In this study, we investigate the effectiveness of Corsi-Rosenthal Boxes (C-R Box) in reducing particle concentrations in active, occupied classroom settings.   A C-R Box is a do-it-yourself, cost-effective alternative to commercial air purifiers built from a box fan, four readily available filters, cardboard, and duct tape.

We collected measurements of coarse (particles with diameters > 2.5μm) and fine (particles with diameters 0.5μm - 2.5 μm) particle number concentrations and PM2.5 (particles with diameter < 2.5μm) mass concentrations. Specifically, we compared measurements in occupied classrooms before and after we turned the C-R Boxes on. In our testing, C-R Boxes reduced fine particle number concentrations by 56-91% and PM2.5 mass concentrations by over 70% after we turn on the C-R Boxes. We also simulated velocity profiles in the classrooms with running C-R Boxes showing mixing throughout the classroom ensuring that all air can encounter the filter.

View Study

In The News

  • Opinion: Why Haven’t We Made It Safer to Breathe in Classrooms?
    Two years ago, we got a chance to assure parents and teachers, in any future epidemic, that the air in classrooms was safer, making it easier for children to attend school in person and avoid learning loss and isolation. In March 2021, Congress allocated $122 billion for schools to cope with the Covid pandemic and […]
    Posted on August 9, 2023


Generous Funding By

Hayley's Hope and MIchaela's Miracle MS Memorial Fund logo

Balvi Filanthropic Fund