Philips Respironics Ultra-fine filter, disposable (2 per pack) (1035442)
The Philips Respironics Ultra-fine filter uses electrostatic fiber technology to trap tiny bacteria and virus particles that can easily pass through other types of filters. The filters are designed for several models of Philips Respironics CPAP Machines including the System One and M Series. For best results, the disposable filters should be replaced every 30-90 days. Comes with 2 filters in every pack.