4-1 Don Your Mask: Check Mask


  • Place the palms of your hands over both inlet valve caps.
  • Seal the valves by applying pressure. you can either put your hands over or under the hood to do this.
  • Suck in and hold your breath. If there are no leaks, your mask will collapse against your face and stay that way until you breathe out.
  • If your mask does not collapse you must reseat it, and if there are no leaks you may start breathing normally.