Air filters

Air filter open project

 * DIY Air Filters For Classrooms? Experts Are Enthusiastic — And A Citizen Scientist Makes It Easy
 * Open Source Air Purifier
 * The Homemade Air Purifier That’s Been Saving Lives During the Covid-19 Pandemic
 * DIY box fan air filters – Corsi-Rosenthal box
 * Corsi–Rosenthal Box (Wikipedia Reading) - "The Corsi–Rosenthal Box, also called a Corsi–Rosenthal Cube or a Comparetto Cube, is a design for a do-it-yourself air purifier that can be built comparatively inexpensively. It was designed during the COVID-19 pandemic with the goal of reducing the levels of airborne viral particles in indoor settings."
 * Minimum efficiency reporting value (Wikipedia Reading) - "Minimum Efficiency Reporting Value, commonly known as MERV, is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) to report the effectiveness of air filters in more detail than other ratings."