Humidification adds moisture to the CPAP air, reducing irritation to the nasal passages caused by the increased airflow.
CPAP air is an irritant - to one degree or another - to everyone. In some cases the irritation dries out the nasal passages and may cause bleeding. It may also cause swelling, excess mucous, congestion or sneezing. The irritation also creates a very fertile ground for infections to begin. The irritation may be cumulative, building up over time. The only way to reduce the irritation is to add moisture.
Humidification is therefore a critical part of CPAP Therapy.
Heated Humidifiers use heat to produce moisture. The heat is adjustable for more or less moisture, and the chamber is much smaller than a passover humidifier.
Passover Humidifiers have a chamber of water added to the CPAP to help moisten the airflow and reduce irritation to the nasal passages.
Air flows from the CPAP, through a short hose to the humidifier, then into the six foot hose to the mask. The air picks up whatever moisture it can as it "passes over" the water in the chamber.
Passover humidifiers may provide suffcient moisture with CPAPs set at lower-end pressures, but if not, there is no way to increase the amount of moisture produced. Furthermore, in cold climates, the water temperature in the chamber will drop, causing the CPAP air to become very cold and reduce the amount of moisture.
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