The machine which delivers this positive air pressure (up to 20 mm /H20) does so at a continuous sound volume of 38 dBa. That, according to the following chart is slightly louder than soft music and slightly quieter than a whisper.
It seemed to me to be an unusual way to get the equipment. The sleep lab sent the report to my primary physician who called durable medical equipment (DME) and ordered the CPAP. DME called me to alert me of the shipping. Two days later 3 boxes appeared on our front doorstep. A note inside one of the boxes instructed me to call the sleep lab. They called back and we agreed upon an appointment, really a class time when I will haul the boxes back to the sleep lab and for 1.5 hours learn how to turn it on and off and clean the filter.
In spite of the instruction to not remove the equipment from the boxes, I did take them out to look them over. I ddn't turn the machine on because of the tattle-tale chip inside which collects data on sessions run and successes or problems. Only after the class am I supposed to try out the machine.
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