Here’s an article from one of the namesakes (the origin story is somewhere on the site): https://www.texairfilters.com/testing-the-efficiency-of-merv-13-corsi-r

Here’s an article from one of the namesakes (the origin story is somewhere on the site): https://www.texairfilters.com/testing-the-efficiency-of-merv-13-corsi-rosenthal-boxes-in-use/ https://www.texairfilters.com/testing-the-efficiency-of-merv...