It might work better if I could get the heat tube to fit my air sense 11. I have called twice. The first time my wife called , he said he could not help since he didn’t know what she was talking about. The second time I called & he said some plastic needed to be removed from the ninety degree end in order for it to fit my machine. He said he was going to send me a link to watch a video on how to do it. Never received video link