4 ms·

I'm not familiar with this topic. Please explain.

• p1mrx 6y ago
  Valves are designed to bypass the air filter when breathing out. This makes sense if you're working alone in a dusty environment, but not if you're trying to prevent stuff in your lungs (virus particles) from reaching people around you.
  • 83457 6y ago
    Ah. That makes perfect sense now. Thank you
• drivingmenuts 6y ago
  It should be clearly stated that a valve mask is for industrial use only (wood can’t catch Coronavirusis - yet). Non-valued is for use in social settings to correctly contain exhalation droplets and other effluvia.