Q:Hose Size Setting

[SleepFoo]

On my Aircurve there is a hose setting that I'm not sure what it should be set at.
The main hose says 15 on it, not sure if that's thin or standard. 
But then the mask I am using, the nuance pro has a slimmer short attachment hose that goes into the main hose.
Should the setting be set to Standard hose or Slim hose?

Thanks in advance.

[Crimson Nape]

The 15 mm is a slimline hose. A regular hose is 19 mm. All hoses have a standard 22 mm connectors. You select the hose size that is connected to your CPAP. A ClimateLine (heated) hose will automatically override your current setting when it's connected to the CPAP.

[SleepFoo]

Thank you