DIY air filters can be safe, simple and inexpensive. Here’s how to make one By Ada Tseng Assistant Editor, Utility Journalism Sept. 17, 2020 1:36 PM PT ...

4. Plumb Hose from the Filter to the Brush From the hose barb on the “OUT” port of the filter mount, run a hose back into the parts washer tank through the other grommet.

But add several layers of a HEPA filter, and it will block 80-90%, "approaching (the rates) of N95 masks." Ultimately, Burken said he recommends using a filter if you have an appropriate, safe ...