Why Is There No Humidity When Using F 30 Mask?

[palerider]

This is so weird. I use pretty much maximum humidity and I have never had a problem when I switched masks even when I experimented with full face masks. My primary mask has always been a nasal pillow mask.
My nose is super sensitive to getting dried out easily.
I have never tried the F30 though.
Changing masks shouldn't cause the machine to deliver less moisture.

Changing masks *can't* cause the machine to deliver less moisture...

Perception, preconceived notions

[Geer1]

Do you use the same humidity setting (8) with the nasal mask or did you increase the humidity setting to try and deal with dryness? If so have you also adjusted your hose temperature and do you have signs of rainout?

It is my understanding that increasing humidity without increasing hose temp can cause rainout. If that is happening and you have your hose so that it drains back to machine you might not be seeing any advantage in the higher humidity settings because the extra humidity rains out and drains back to the machine before it reaches you.

The mouth breathing statement by others may also be a possible factor although I am torn as to whether it would increase moisture or decrease it. Too much airflow has a drying sensation but minimal extra flow would cause more moist air to flow through your nose and it might help the moisture accumulate in your nose (catching on nose hairs, condensing on skin etc).

If you combine the two theories then mouth breathing would allow more higher humidity air to reach you because it moves fast enough to combat the rainout. Anyways just a couple potential theories, if neither are right I have to agree I don't see how it could be the mask making the difference.

Here are some documents on humidity/hose temperature settings etc.

https://www.resmed.com/us/dam/documents ... sa_eng.pdf

https://www.resmed.com/us/dam/documents ... lo_eng.pdf

[Pugsy]

It is my understanding that increasing humidity without increasing hose temp can cause rainout.

It can but it isn't a given. It all depends on the ambient room temperature.
If like my mom or Avi (old forum member) who keeps the house at 75 degrees...probably doesn't matter what the hose temp setting is...the ambient air is warm enough to not cause the cooling down which allows condensation to happen.
If like me...whose bedroom runs around 60 degrees on a warm day...most definitely I will see condensation and sometimes even at the max hose temp setting.

[Biomed_ZZZ]

I'm new to CPAP use but this was my observation last night using a Repironics Dreamwear FF vs Dreamwear nasal mask. Without changing humidity level or hose temp I seemed to use about the same amount of water but my throat was definitely bothering me with the FF mask vs nasal mask. I will assume it's because the amount and velocity of air being exchange from my mouth caused my throat to dry out which makes sense as more water can evaporate from a body of water on a windy day then when it's calm out.