DIY air filter also known as the Corsi-Rosenthal box or CRbox. MERV 13 filters and a fan!
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 100!) of these!Read More »DIY box fan filters – Corsi-Rosenthal box