Where can I find the original Build instructions in the Mega Corsi/Rosenthal thread? A Where can I find the original Build instructions in the Mega Corsi/Rosenthal thread? Permalink Click here to go back to all FAQ’s.A mega thread on the ultimate DIY air filter known as the Corsi/Rosenthal Box (@CorsIAQ/ @JimRosenthal4).Take it into work. Donate a couple to your school classroom if they'll let you.Illustrations beautifully done by @ughberta, discovered through @kprather88. pic.twitter.com/zhrh7Ovs22— Lazarus Long (@LazarusLong13) August 11, 2021Click here to go back to all FAQ’s. Did you find this FAQ helpful? 1 0 Share facebook twitter linkedin pinterest email Back to Top nextWhere should it/they be placed in the room?