Depends on which type you wear. The ones I had to suffer with when I worked in the hospital definitely had no such vent. You put that mask on like a vice and breathed hard through it. You got used to that slight lightheadedness and were grateful when you were done with the patient who required it so you could take the damn thing off. And that's if you were insistent on doing it the right way and didn't cheat it.
That's beyond stupid, they have a vent that let's air out unfiltered. They only filter air coming in. Others may be different
Depends on which type you wear. The ones I had to suffer with when I worked in the hospital definitely had no such vent. You put that mask on like a vice and breathed hard through it. You got used to that slight lightheadedness and were grateful when you were done with the patient who required it so you could take the damn thing off. And that's if you were insistent on doing it the right way and didn't cheat it.
Did you manage to avoid the jab?