the two respirators I know of that do not were designed by amateurs during the COVID pandemic
I’m aware of at least the ElastoMaskPro, Flo Mask Pro, and Envo Pro N95. Are these what you’re talking about?
almost all industrial respirators have valves
Sure, but they’re also not designed for infection control. If you’re using them in a situation where you don’t need source control, then a valve is great. But ones designed for medical contexts generally don’t have valves.
I’m aware of at least the ElastoMaskPro, Flo Mask Pro, and Envo Pro N95. Are these what you’re talking about?
Sure, but they’re also not designed for infection control. If you’re using them in a situation where you don’t need source control, then a valve is great. But ones designed for medical contexts generally don’t have valves.