[Perfect Compatibility]Designed for seamless use with most CPAP and BiPAP machines, this filter kit fits perfectly with 22mm tubing and 25mm mask elbows. Each filter ensures a snug fit, enhancing your device's performance without the need for complex adjustments. [Optimal Airflow Maintenance]Constructed with advanced hydrophobic materials, our CPAP filters promote high filtration efficiency while maintaining robust airflow. This design ensures that you receive clean, uninterrupted throughout your sleep therapy sessions. [Installation Simplicity]Our CPAP filters are crafted for easy setup without needing recalibration. Attach the filter between your machine's air outlet and the tubing, power up, and enjoy a consistent flow of purified air, enhancing your sleep quality effortlessly. [Maintenance Reminder]To maintain optimal performance of your CPAP/BiPAP machines, it is advised to replace the filter every 4-6 weeks depending on usage and environmental conditions. This pack includes 9