Use Carex disposable filters for your Philips Respironics CPAP machines (like System One, 60 Series, and SleepEasy). Change the filters every two weeks to keep the air clean. Each pack has 6 small filters (1 x 7/8 inches) that protect your CPAP from dirt, making it safe and efficient. Get Carex filters as an affordable replacement for Philips filters, ensuring your sleep therapy air is clean for easy breathing. The product depth is 0.75 inches.