Research

Effectiveness of commercial portable air cleaners and a do-it-yourself minimum efficiency reporting value (MERV)-13 filter box fan air cleaner in reducing aerosolized bacteriophage MS2

In an unventilated room, 2 commercial portable air cleaners with HEPA filters and a do-it-yourself box fan air cleaner with MERV-13 filters significantly reduced aerosolized bacteriophage MS2.

Corsi-Rosenthal Boxes with “Used” MERV 13 Filters Can Produce Cleanroom Particle Levels

Jim Rosenthal

Corsi-Rosenthal Boxes can produce extremely low particle counts, whether new or used filters are in place. Air Flow is important, and MERV 13 seems to be just right for capture. The results of using two box filters can result in clean-room level clean air.

Testing Different Configurations of Do-It-Yourself Portable Air Cleaners

UC Davis

The Corsi-Rosenthal Box Filter “was estimated to perform similarly to residential portable air cleaners that are approximately three times as costly in terms of clean air delivered.”

The Effectiveness of DIY Air Filtration Units

CDC - NIOSH Science Blog

“DIY air filtration units can be an effective means of reducing aerosol exposure. The DIY units reduced aerosol exposure up to 73%”

Science in Action: How to Build a Corsi-Rosenthal Box

UC Davis College of Engineering

Follow Dr Corsi as he shows you how to build your own powerful air cleaner.

Research on DIY Air Cleaners to Reduce Wildfire Smoke Indoors

United States Environmental Protection Agency

“DIY) air cleaners, made with a box fan and MERV 13 air filter, are a cost-effective method for reducing smoke concentrations.”

Effectiveness of HEPA Filters at Removing Infectious SARS-CoV-2 from the Air

Hiroshi Ueki, Michiko Ujie, Yosuke Komori, Tatsuo Kato, Masaki Imai, Yoshihiro Kawaoka

Testing mobile air purifiers in a school classroom: Reducing the airborne transmission risk for SARS-CoV-2

J. Curtius, M. Granzin & J. Schrod

Staying for 2 h in a closed room with a highly infective person, we estimate that the inhaled dose is reduced by a factor of six when using air purifiers with a total air exchange rate of 5.7 h.

A Variation on the “Box Fan with MERV 13 Filter” Air Cleaner

Jim Rosenthal

How it all started, back in 2020.

Can 10× cheaper, lower-efficiency particulate air filters and box fans complement High-Efficiency Particulate Air (HEPA) purifiers to help control the COVID-19 pandemic?

Devabhaktuni Srikrishna

Characterizing the performance of a do-it-yourself (DIY) box fan air filter

Rachael Dal Porto, Monet N. Kunz, Theresa Pistochini, Richard L. Corsi & Christopher D. Cappa

Our results demonstrate that our Corsi-Rosenthal air cleaner efficiently reduces suspended particle concentrations in indoor environments.

Efficacy of Do-It-Yourself air filtration units in reducing exposure to simulated respiratory aerosols

Raymond C.Derk

This study found that:

COVID-19 Cases By Potential Exposure Location

Illinois Department of Public Health

42% of cases were in schools and colleges

Do-it-yourself (DIY) air cleaners: Evidence on effectiveness and considerations for safe operation

National Collaborating Centre for Environmental Health

“DIY air cleaners appear to be a valuable, low-cost tool to reduce hazardous PM exposures.”

Impact of do-it-yourself air cleaner design on the reduction of simulated wildfire smoke in a controlled chamber environment

Amara L. Holder et al

This study has shown that DIY air cleaners can be a cost-effective approach to reducing smoke concentrations.

Assessing Mitigation Strategies to Reduce Potential Exposures to Indoor Particle Release Events

Van Valkinburgh, K, et al

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.

SARS-CoV-2 indoor air transmission is a threat that can be addressed with science

Jonathan M. Samet et al

Airborne transmission of respiratory viruses

Chia C. Wang et al.

Impact of Wildfire Smoke Events on Indoor Air Quality and Evaluation of a Low-cost Filtration Method

Nathaniel W. May et al

MERV-13 filters and box fan is a low-cost alternative to commercial filter units. The Low-cost method effectively filters wildfire PM2.5 and submicron particles.

Ten scientific reasons in support of airborne transmission of SARS-CoV-2

Trisha Greenhalgh et al

Reducing transmission of SARS-CoV-2

Kimberly A. Prather et al

Masks and testing are necessary to combat asymptomatic spread in aerosols and droplets

The Corsi-Rosenthal Foundation

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Effectiveness of commercial portable air cleaners and a do-it-yourself minimum efficiency reporting value (MERV)-13 filter box fan air cleaner in reducing aerosolized bacteriophage MS2

Corsi-Rosenthal Boxes with “Used” MERV 13 Filters Can Produce Cleanroom Particle Levels

Testing Different Configurations of Do-It-Yourself Portable Air Cleaners

The Effectiveness of DIY Air Filtration Units

Science in Action: How to Build a Corsi-Rosenthal Box

Research on DIY Air Cleaners to Reduce Wildfire Smoke Indoors

Effectiveness of HEPA Filters at Removing Infectious SARS-CoV-2 from the Air

Testing mobile air purifiers in a school classroom: Reducing the airborne transmission risk for SARS-CoV-2

A Variation on the “Box Fan with MERV 13 Filter” Air Cleaner

Can 10× cheaper, lower-efficiency particulate air filters and box fans complement High-Efficiency Particulate Air (HEPA) purifiers to help control the COVID-19 pandemic?

Characterizing the performance of a do-it-yourself (DIY) box fan air filter

Efficacy of Do-It-Yourself air filtration units in reducing exposure to simulated respiratory aerosols

COVID-19 Cases By Potential Exposure Location

Do-it-yourself (DIY) air cleaners: Evidence on effectiveness and considerations for safe operation

Impact of do-it-yourself air cleaner design on the reduction of simulated wildfire smoke in a controlled chamber environment

Assessing Mitigation Strategies to Reduce Potential Exposures to Indoor Particle Release Events

SARS-CoV-2 indoor air transmission is a threat that can be addressed with science

Airborne transmission of respiratory viruses

Impact of Wildfire Smoke Events on Indoor Air Quality and Evaluation of a Low-cost Filtration Method

Ten scientific reasons in support of airborne transmission of SARS-CoV-2

Reducing transmission of SARS-CoV-2