Rainout

Rainout is when you are using a heated heated humidifier and start getting water in your hose. It's caused by the steamy air coming from the humidifier at a higher temperature than the surrounding room air, so it cools on the way to the mask. While it leaves the humidifier as "humid air" when it cools, it reaches the mask as "water" and you get a damp face.

People use a heated hose or a hose cover to help resolve this problem, or turn the heater on the humidifier down so that it is closer to room temperature.

Web Links:

http://www.sleepzone.com.au/showitems.asp?heading1='SleepZone%20Heated%20CPAP%20Tube'

https://www.cpap.com/productSearch.php?query=snuggle

Video Links:

https://www.cpap.com/downloadVideo.php?VGID=16