Yeah, but I was only doing air breaks on a 20-5 schedule at 2.8Bar O2, during the slow ascent from 18M no air breaks were done. And yes, my breathing was uncomfortable for a few days after my chamber treatments.even on CCR, my lungs and sinuses do not feel good when at the higher ppO2's for very long and I start coughing if I don't take them. It's worse with the dry gas on OC, but it still happens on CCR. Same reason air breaks are standard for chambers
Michael