Portable air filtration units, or air cleaners, remove airborne particles (called aerosols) from the air indoors. Air filtration units were widely used during large wildfire outbreaks in the western United States,[1] and their use surged nationwide during the COVID-19 pandemic as a way to reduce exposure to aerosols containing the SARS-CoV-2 virus. Homemade or Do-It-Yourself (DIY) air filtration units are an alternative to commercially produced products that can be made from supplies available at local hardware stores. DIY units became popular during the pandemic due to supply shortages and the high costs of HEPA air cleaners. However, comprehensive evaluations
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