I had a partner who put the pt on 4 l/n of O2 via NC, and sat in the airway chair behind her and had a NRB on at 12 l/m. He said it helped him. I opened the back door of the ambulance, saw that and was able to duck around the corner before I started laughing: But I had to go get the ramps for the cot (bari cot, 750lb pt) so it didn't look bad