4 Replacement CPAP Filter for ResMed S9 CPAP & BiLevel Machines

4 Replacement CPAP Filter for ResMed S9 CPAP & BiLevel Machines. Replacement ResMed S9 CPAP & BiLevel Machines CPAP Filter. Quantity: 4 Filters (2 Pack - 2 Filters per Pack). Hypo-Allergenic filters are an essential component to your CPAP machine. They remove dust and pollen particles to let you breathe fresh air.. These disposable filters should be replaced as soon as there is visible dirt debris. For the best filter efficiency replace the filter every month or sooner depending on usage.. Provides additional filtration from airborne allergens. Recommended for users suffering from allergies. Designed and made to equal or better quality than OEM at an affordable price.. UpStart Components Brand