Yes, try sealing the mask tightly just over your nostrils, isolating just your nostrils and try and breath - within seconds you'll realize that if the mask were 100% sealed, YOU COULDN'T BREATH! Also try isolating just your mouth - same thing happens!
Yes, try sealing the mask tightly just over your nostrils, isolating just your nostrils and try and breath - within seconds you'll realize that if the mask were 100% sealed, YOU COULDN'T BREATH! Also try isolating just your mouth - same thing happens!