zoidberg
Well-Known Member
The problem with this sort of mask, for general protection of the comiunitiy, is that it uses an exhale valve. Any thing YOU spray out is unfiltered. Some disposable masks have these too. The principle behind a surgeon's mask it that it catches the wearer's spray. We're not just trying to protect ourselves, we're trying to protect others from us (since we won't always know if we are infected).
I understand the very finely balanced judgements that a professional product-tester routinely makes, but 'half a loaf is better than no bread'.... and those things are a damn sight better than nothing.