I filmed the build. Then, I proceeded to delete my video folder. It had over 500 gigs, and every video I shot in the last 10 months. I am trying to get it restored. If I can't get them, I will build another one. While building it, I saw where it could be built more efficiently. I was amazed at how much air both the diy filters moved compared to the factory one. That is why I refilmed the flow test.
Search Corsi-Rosenthal fans. Binder twine and chewing gum, well, duct tape anyway. Cheap and cheerful. You can use four or five filters, your choice. Make sure you frame the exhaust with circle the same size as the fan blades, otherwise the turbulance allows air to be drawn in in the corners, cutting your efficiency. Think about your unit placementvgor a while. Where is your mitre, table saws and planer? You want it to circulate air around the shop. I also vaccuum of the filters about once a month using a Hepa filtered vaccuum.
Great video and would love a build video on the drum fan. If you could also do a test to show the comparison of PPM particles for each device. Would love to see the difference and how quickly each cleans the air.
I'd also like to see the drum fan build. Did you detect an air quality improvement when you tested the commercial unit with the micron filters, or do MERV filters work just as well?
In my experience, the merv 11 filter out good enough. They claim to capture at least 85% of particles in the 3-10 micron range and at least 65% in the 1-3 micron range, such as pet dander, dust mite debris, and pollen. They also capture over 20% of particles in the 0.3 to 1 micron range, including bacteria and wood smoke. If they don't capture it on the first pass, they will on the next pass. When cutting my meter, it normally stays under 10. It I blow the table or saw off, it might jump up to 100 or more but will return to normal in a few minutes.
