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The original was posted on /r/crboxes by /u/jhsu802701 on 2023-09-21 03:03:31.

This is the mini Corsi Rosenthal box that I built. More details and a link to the form to order the filters is at . Yes, Jim Rosenthal himself is the owner of Tex Air Filters.

The fan is a 10-inch box fan (Comfort Zone CZ9BWTM) that I bought at a local store. The filters are quite a bargain, even with the shipping charges! The entire set of four filters was $40 ($10 each), and the shipping charge was only $6.95. Clearly, Rosenthal wants more people to build and use this mini Corsi Rosenthal box, and keeping the price down encourages more people to do so. If it weren’t for this bargain, hardly anyone would build this mini Corsi Rosenthal box. (In this scenario, the duct fan mounted on a cylindrical filter would be a better value.)

Compared to the full sized Corsi Rosenthal box based on a 20-inch fan, this mini version takes up much less space, is much more portable, and isn’t as loud. While I wouldn’t run this mini Corsi Rosenthal box while watching a TV show or movie or while listening to music, it would be better suited for classrooms and offices than the standard full-sized Corsi Rosenthal box. I use an electrical timer to automatically run my mini Corsi Rosenthal box at periodic intervals during the night.

The bottom of this mini Corsi Rosenthal box consists of cardboard, which I wrapped in clear packing tape to protect it. It will eventually be time to replace the filters, and I will be able to do so without damaging that cardboard piece.

The fan points horizontally instead of upward. Yes, it’s adjacent to the cardboard piece at the bottom.

I use painter’s tape instead of duct tape. Duct tape is notorious for leaving a sticky residue. Painter’s tape, on the other hand, can be removed much more easily and cleanly.