Oh haha, my bad. I assumed you were talking about crowding for biosafety cabinets. Well we do have those reusable head hoods for that, which can be used with a breathing unit. But unless I have work for long hours (3+) in one go, I prefer N95 and face shield over breathing unit.
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Yeah, I’m well-acquainted with working 3+ hours under the hood. I feel for ya.