Reply To: N95 masks with exhalation valves Home › Forums › Decaffeinated Coffee › N95 masks with exhalation valves › Reply To: N95 masks with exhalation valves June 8, 2022 3:47 pm at 3:47 pm #2094692 ujmParticipant Who is discouraging exhalation valves? (And what is their reasoning for doing so?)
