[Huliwang]

If you understand how CPAP works its like saying your belt holding up your pants need a certification or a walking stick need certification .

The cheaper one is certified and used by several million People....in China. It is already quite popular among budget conscious Singaporeans. 

But if so concerned and money is no issue go ahead and get the $3000 one.

As you said this machine blows air into the throat to keep the passage open while the patient is asleep and no longer in control. So it has to be a very precision and reliable piece of machine that needs high standard of quality control. So it is rather dangerous too look around and buy equipment that cost only a fraction of the high quality ones. This is medical equipment and not a piece of bicycle pump where you look for the cheapest and can sell the highest price here. Dun think you will look online for a heart peacemaker if you are to use it. If this machine goes haywire in the middle of the night, you might find a blown up balloon size human dead on the bed.

You claimed several million people in China are using this cheap piece you bought and this information you found out from your Virtual travel is it?......