Enjoy the sweat that builds up between the rubber seal and your upper lip. These things weren't meant to be worn all day. Also, exhale valves absolutely are prohibited on aircraft right now.
What the fuck kind of Chinese made, knock off respirators are you using
3M. Also, all of them have such a high internal volume they'd be even more torturous to use without a valve. You'd be rebreathing a lot more. So they all have valves, won't protect Joe Biden from your nasty covid, and therefore aren't allowed.
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