From CpapWiki
Passover Humidifier
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A Passover Humidifier is used in conjunction with an xPAP machine to produce cool moisture, which flows from the xPAP, through a chamber filled with cool water, and to the mask. The purpose of a Passover humidifier is to keep the patient’s nasal passage from becoming dry and sore. A Passover humidifier is not plugged in to an electrical outlet and does not have a heater plate.