Compatibility: Our HME filters are only compatible with AirMini CPAP Machines using AirFit N20, AirFit N30 Nasal Masks & AirFit P10 Nasal Pillows. Our product features precise size compatibility, and its compact yet efficient design allows for easy insertion between the mask connector and vent, providing effective and comfortable humidification. This not only enhances the efficiency of the CPAP machine but also ensures optimal sleep therapy.