The Live Equip CPAP and BiPAP filters are compatible with all Resmed S9 and Air10 series CPAP and BiPAP machines. This includes ResMed AirSense 10, ResMed AirCurve 10, ResMed S9, ResMed AirStart Series. The air filter on your CPAP machine is responsible for respiratory health, so keeping the filter in top shape should be a priority for the well-being of anyone who deals with sleep apnea. The Live Equip CPAP and BiPAP filters are made of ultra-fine spinning fiber and have four layers, effectively filtering fine particles, dust, and pollen. The Live Equip CPAP and BiPAP filters come in different pack sizes to suit your purchase requirement. We recommend replacing your filter every four weeks. The consistent change of the air filter can prolong the life of your machine. Good filtering performance helps keep your lungs clean and prevents dust, dirt, and other build-ups from entering your CPAP or a BiPAP machine.