The Corsi-Rosenthal box is an inexpensive air filter you can easily make yourself using a box fan. Learn how they work and get instructions for how to make one.

If your air quality is bad and you don’t have an air purifier, an HVAC filter taped to a box fan is better than nothing.

A smaller and more affordable approach is to attach one MERV filter to the back of a box fan, an idea laid out in a website from the Montana group Climate Smart Missoula.

Just one day before classes began, UCSD students and staff helped make their classrooms safer against COVID-19 by building DIY air filters out of boxes and fans.

Ithaca High School teacher Hallie Snowman is turning box fans into air filters for classrooms at the high school with the purpose of reducing COVID-19 transmission. The 11th and 12th-grade teacher ...