The PPH has recommended anti-coronavirus helmets and positive pressure full face masks that can be modified to provide IG. The 3M versaflo headgear is shown in previous versions too along with MicroClimate Air 3 and in the most recent, Allegro supplied air respirator mask. Based on the picture, the allergo seems easier for use and has an exhaust. The versaflo didn't have a great explanation shown but testing information. And the Air 3 doesn't have any explanation. Is anyone familiar with how this works? Or any of those other ones? A thread on this would be helpful
