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The original was posted on /r/crboxes by /u/jhsu802701 on 2023-09-20 07:19:15.

Here’s a design consisting of a duct fan on a cylindrical filter:

Here’s a Corsi Rosenthal box consisting of a duct fan and HEPA air filters:

I haven’t tried building an air purifier out of duct fans. From what I’ve read, the duct fan’s advantages over a 20-inch box fan are these:

  • Not as loud
  • Takes up less space

On the other hand, the duct fan is more expensive and not as powerful.