The south end flow bench HEPA filter should be run all times. You can turn it off for a measurement or two but remember we are storing clean optics there.
The zero count bench will reach room particle count ~ 10,000 in one minute.
My bad. I turned it off last night to see if it would help make the Xgreen more stable, and then when I woke up this morning I realized that I had forgotten to turn it back on. Bad Jenne.