Fangrui Product Details Enhanced Breathing Experience: Our Cpap Filters Are Designed To Block Over 99. Of Harmful Particles, Ensuring That Only The Cleanest Air Reaches Your Lungs. This Advanced Filtration Technology Helps Maintain A Healthy Respiratory System, Especially Crucial During Sleep. Optimal Airflow For Comfort: Cpap Filters Are Engineered To Not Restrict Airflow, Ensuring That You Can Breathe Easily And Comfortably Throughout The Night. If You Experience Any Difficulty In Breathing, Simply Adjust Your Machines Airflow Settings For Immediate Relief. Universal Compatibility: These Filters Are Universally Compatible With All Standard And Heated Cpap Tubing. Regular For Maximum Efficiency: To Maintain The Highest Air Quality, The Filters Every 3-4 Weeks Depending On Environmental Conditions. Regular Helps Capture More Impurities And Enhances The Overall Effectiveness Of Your Cpap Machine. Installation Advice For Heated Tubing: If You Use Heated Tubing, Do Not Connect The Filter Directly