Well, I found some info in the various manuals and from measurements and observations.
All the (non-heated) tubing I have (Respironics 1032907 & 622038) is slightly ribbed on the inside due to its spiral construction and measures 22 - 23mm od (outside diameter) and 19mm id (inside diameter). I have no ClimateLine tubing, yet.
For the ResMed S9 Autoset, apparently, the air outlet is listed as 22mm but that is the outside diameter (od) measurement. Its inside diameter (id) measurement is 19mm. The Philips/Respironics System One REMstar AUTO 560's air outlet measures 22mm od and 18mm id on the unit I am currently trialing. My old Respironics ResMed Auto M's air outlet measures 22mm od and 19mm id.
For the ResMed S9
- SlimLine (15 mm inner diameter)
- Standard (19mm inner diameter)
- ClimateLine (15mm inner diameter, with the H5i humidifier) and
- ClimateLineMax (19mm inner diameter, with the H5i humidifier)
air tubing can all be used.
The S9 automatically sets the tubing type if the ClimateLine (15mm) or ClimateLineMax (19mm) is used. Otherwise it must be set for SlimLine (15mm) or Regular (19mm) tubing. I suppose 22mm tubing cannot be used with the S9 series.
Also apparently, the S9 is slightly quieter without the H5i humidifier than with.
Also apparently, and counter intuitively, without the H5i, the sound pressure level, ISO 17510-1:2007, is 26dBA using the SlimLine tubing and 27dBA using the Standard tubing. While the difference between 26 and 27 dBA is essentially negligible, the fact that the SlimLine's value is lower is surprising. The sound power level, ISO 17510-1:2007, is also 1 dBA quieter for the SlimLine than the Standard, without the H5i. [Unless there should have been a minus sign in front of the dBA values. Or does SlimLine tubing have a smooth interior and Standard a ribbed interior?] If the H5i is
used there seems to be no difference between the two tubing types.
For the Philips/Respironics System One REMstar AUTO 560, 15mm, 22mm or 15mm heated tubing can be used, according to the manual.
Yet my Respironics tubing (1032907 & 622038) measures 22m od and 19mm id. So what is the 22mm tubing mentioned in the Respironics manual. And where does my 19mm id Respironcs tubing fit it? Is it usable on the System One?