Probably because hospital staff are the ones who would afford it and truly benefit. Maybe some patients there. It's probably too late for most of them. Single

Probably because hospital staff are the ones who would afford it and truly benefit. Maybe some patients there. It's probably too late for most of them. Single use masks are much easier, but indeed there's a lot of mask-like products that have enough leakage to let a tank through, or have an unfiltered vent which is unacceptable.