Is that really 4 commercially available air filters with a box fan on top? $11.5 million for taping air filters together? Are you fucking kidding me? These are already in school air systems!
I have absolutely no winter gear. If things pop off in cold weather, I'll be out there in Carhartt overalls and an M-65 field jacket.
With an Elmer Fudd earlapper hat and insulated rubber boots.