[palmer]

I compared it to a net with a weave small enough to catch an aircraft carrier but the rowboat goes right through.

The right masks, properly fitted, can stop virsuses. The weave is not an issue, it is on the order of magnitude of the virus size.

[Bulwyf]

No, there is no mask that will do as you claim. A full hazmat suit with oxygen would though. Let’s all get those.