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Product description: These are compatible spare parts, the manufacturers' names and part numbers have been mentioned for reference purposes only. Our filter cotton is composed 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 Philips Respironics M Series, PR System One and SleepEasy 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: Black foam filter Size: 15/16" x 1 11/16" White ultra fine filter Size: 7/8“x 1 3/4” White filter material: ultrafine spinning fibre cotton Black foam filter material: reusable high density foam Quantity: 40 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. 4, This is not an original product, compatible with Philips Respironics M Series, PR System One, SleepEasy, REMstar and BiPAP machines