Also known as a Corsi-Rosenthal box, this DIY method of building your own air filter with MERV13 furnace filters and a box fan are an easy and cost-effective way to help clear indoor air from airborne virus particles, wildfire smoke, pollen, dust, and more! If you can seal a box, you can build one (or… Read More »DIY box fan air filters – Corsi-Rosenthal box
Source: DIY box fan air filters – Corsi-Rosenthal box – Clean Air Crew
