My neurologist has informed me that my So Clean Machine suffers from the same dangerous foam and fibers as the recent CPAP machines. The doctor said to return it or trash it. I am offering to return it to you, but would expect a decent refund on my machine. I am retired with a fixed income but I paid $300. For my So Clean machine. Please advise. Thank you very much for your help with this. I await your response. Ann Haudreaux User's recommendation: Do not buy this machine.