Lack Enclosure HEPA Filter System

by Cybertron3D Jan 22, 2019
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I was doing a bit of research on HEPA Filters. but coudn't conclusively find the info i need. I was wondering if you can help.

Did you by any chance design the system? (with parameters like like air cycling, pressure, flow etc). Which will feed to the next question, how to decide which fan is better (any reason to get 110CFM fan over, say, 50CFM or 200CFM one)?

Interesting question, can explain how I came to this design.

If you look at the thing description, you will see the original design that used a smaller fan and no HEPA filter. In that design, I used a couple of basic fabric filters, nothing high efficiency. After a few weeks of printing, it went from white to an orange color, not shocking since I was doing a lot of red and orange printing.

That to me was a shock as I didn't realize how much the printers put off till then. In doing some asking around and reading, to which it seems a bit of a religious debate, I found an article from the American Chemical Society. It states that while the particles can be smaller than a HEPA filter can filter out, it did show a 98% reduction in particulates while once was used on the enclosure.

The basis of my design was that I had no intention of trying to make a system that was a perfect design, with the Lack enclosure sealing is damn near impossible. I just wanted something that would move air, even not at a high rate, and get it through a filter. I went with the larger fan simply to get more air through the HEPA as the smaller one wasn't going to cut it. The HEPA filter puts some serious restriction on even the 110 CFM fan.

How did I test it? Two fold, first I printed with it and both the pre-filter and HEPA filter did change color. Which tells me it is trapping the particles. Second, to really see how strong the airflow was. I placed a piece of 8.5" x 11" sheet up paper on the intake grate and there was enough draw that it held the paper in place. As I said, not looking for high airflow or the perfect system, just something that could move air through the filter.

Hope that helps

Thanks, @Cybertron3D. It does help a lot. I have a sealed enclosure with a recirculating HEPA and carbon Filter. The designer guaranteed 98% reduction in the particulate matter for PLA and PETG, and 50% for ABS. What really keeps bugging me is that he designed the filter and measured with an instrument to show results. Granted ABS releases particulate matter in the multiple of 10s than PLA, but I think that design has some liberties in them. so I decided to look for a better design. His design uses a blower rated at 50CFM with a maximum pressure of 2.3" H2O and this fan was 110CFM with a max pressure of 0.3" H2O. I really don't know where all the design parameters are coming from. So I had to know the difference. hopefully, I can find them all. :)

How loud is that fan ?

I won't lie, it is not quiet. It needs a stronger fan to pull it through the HEPA filter. If you look at the previous version of this, which is in the description, that fan is quiet but it is not HEPA.