Filters are the first line of air filtration defense for your CPAP system and should be replaced when dirty or every month. Standard filters trap large floating particles such as cat hair and dander. Your machine will typically come with a standard filter. Return On Warranty Issues Only
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Important Tips
This is a 3rd party duplication of the standard filter that comes with your S9 Series CPAP Machine.
The S9 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.