For the Philips REMstar Plus C-Flex, page 5 of the User Manual suggests under the section Installing the Air Filters
1. If you are using the white disposable ultra-fine filter, insert it into the filter area first, mesh-side facing in.
What do they mean by the mesh side. Is it the soft side or the not-so-soft side?
One side seems to be easier to breathe through (the soft side) than the other side. *shrug*
|Machine: PR System One REMstar Plus CPAP Machine with C-Flex|
|Mask: Swift™ FX Nasal Pillow CPAP Mask with Headgear|
|Humidifier: REMstar Heated Humidifier|
|Additional Comments: Large nosepillows. Testing with chin strap.|