I use a phillips respironics system one cpap machine.It needs its humidifier to keep the air warm enough to breathe and moist enough to keep from totally dehydrating your airway.Unfortunately, the humidifier only holds 3 hrs to 4 hrs of water.Once it runs out the heating element pumps noxious fumes into your lungs for the rest of the night.It should shut off when it runs out of water and not superheat the air or give off the fumes which are noxious.The lack of sufficient water defeats the purpose of having a device intended to help you sleep all night.
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