>>11411166Yes, they absolutely do, but you can't rely on those disposables to do more than reduce your risk of contraction by a moderate amount. To entirely eliminate it, you need a full face respirator with N100 or P100 filters (P are for working in oily industrial environments, N are fine for this application but P are more commonly available).
The reason why you need something like pic is because coronavirus can be contracted through the conjunctiva (eye tissue), those disposables are almost always N95 (not good enough), and unfiltered air easily makes it around the edge of disposables. A real respirator has a thick gasket around the edge. After putting it on, you do a vacuum test to ensure the fit. You MUST be clean shaven for the gasket to be reliable.
These things are also much more comfortable. They're designed to be used in toxic environments for a full work shift in tough conditions.
>>11412550This will work if you can produce enough ozone, but then you'll be breathing ozone... Buy a real mask.
