This is the standard filter that comes with your SleepStyle 900 Series CPAP & APAP Machine.
The SleepStyle line machines come with a disposable filters. The filter is a fibrous material that wards off large particulate matter.
This is a set of standard filters for the ICON Series of CPAP Machines. This filter cleans large particulate matter from the air as it enters the CPAP or Bilevel machine.