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We are well aware of the fact that sleeping disorders can affect the quality of your life adversely. So, we take it as our responsibility to design and offer best CPAP filters to help relieve your sleep disorders for a good night's sleep and ultimately great quality of life. Product description: Our filter cotton is composed of 4 layers of ultrafine fiber, which can effectively filter fine particle dust and increase air resistance to a certain extent without affecting the use and only to improve your air quality. It is suitable for the ultra-fine dust filter of the ResMedAirSense 10, the ResMedAirCurve 10, and the ResMedS9 series of ventilators. The ultra-fine PM2.5 ultra-clean air dust filter cotton can effectively filter extremely fine dust particles in the air, so as to ensure that you can get clean air and improve air quality when using the ventilator. Product specification: Size: 2 1/8" x 1 7/16" Material: ultrafine spinning fibre cotton Quantity: 20 pieces Filtering performance: excellent Note: 1,Filter cotton is a consumable product, which needs to be replaced once or twice a month. Please replace it in time to protect your lungs and health, and protect your CPAP machine. 2,Our packing is sealed. When you're taking out another piece to use, it should be sealed and kept in time. 3,Please check twice whether your ventilator model number matches ours.