Hi,
I think a good point here concerning health and safety issues that should be noteworthy is that dust collection systems should be located outside of your shop because of the micron size particles that pass the filters or micron bags become airborne after passing through the media.
When I set up my new shop last year I bought an old 5 1/2 x 12 enclosed trailer and set up my two big units inside it. I ran the suctions through he walls of the shop and the trailer and use the remote control unit to turn them on. A few isolation blast gates and no more fine particulate in the air.
Coal Miners and deep sea diving habitats used canaries to monitor air quality as a crude telltale in the old days and was later improved with instrumentation equipment. We just check the TV screen for dust. Before we got the trailer isolation thing going out side, that screen was disgusting in short order. Now a days one paper towel and a little windex every couple of weeks so we can enjoy our shows on a clean screen. Before the stuff on that screens was a pretty good telltale of our lung exposure.
Be safe.
Rick G