>INCREDIBLY CLEAN AIR Functions along with the equipment's built-in filters as the air exits the CPAP or BiPAP machine giving incredibly clean air throughout the night >PRESERVES A POWERFUL AIR FLOW our filters has a low resistance to gas flow system which keeps the CPAP/BIPAP machine's strong airflow going >USE IT AND DISPOSE IT our filters lasts for 4 to 6 weeks on average before needing to be replaced. >Universal Fit the our filters will fit most machines, it should be attached between the machine’s air or outlet hose.