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| 07-12-2022, 10:19 AM | #16 |
 Originally posted by Wheatfield  I also saw a youtube video where a guy had built a room dust filter using a 20" box fan and furnace filters attached to it making a 20x20x20 inch box with the fan as one side. | |
| 07-12-2022, 12:42 PM | #17 |
| Originally posted by wadge22 That's the Corsi-Rosenthal box. They were developed and refined during (the earlier parts of) Covid. | |
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