This filter works to remove particles in the air before entering your CPAP or Bilevel machine. This extends the machine's life and increases air purity for you. Sold individually.
Recommended replacement every 6 months, taking out once a week to shake excess dust out.
S9 and Air 10 standard filters
They are what my machine uses. Excellent
Without it I would not last half a day at work before I would get too tired from not sleeping at night
Air 10 Filter
They definitely do there job
S9 and Air10 Standard Filter
Do the job they are intended to do - easy to change.
I have not received filter !