The S9 & S10 Air Sense line of CPAP machines do not use reusable foam and disposable fine
filters, like other machines. The standard filter is a fibrous material that
wards off large particulate matter like hair or dander.

Filters are the first line of air filtration defense for your CPAP system and
should be replaced when dirty or at least. Standard filters trap large
floating particles such as cat hair and dander. Your machine will typically come
with a standard filter.

Works for:

Res Med s9 Series of Machines

Res Med Air Sense Series of Machines