Who sanitizes the room air?
People with clean rooms?
Yep, rooms with positive pressure through a HEPA filter.
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I aerate in my basement. The air is not sanitized. But my aeration stone is.
I've had very few infections in 20+ years of brewing.
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Well I have had good luck too, and have done some “open” fermentations.
Some breweries do open fermentation in a room supplied with sanitary air. Sierra Nevada uses sterile filtered air to oxigenate their wort.
If I use an aquarium pump to aerate, it has a sterile filter in line, just because. Haven’t done that in a while.