Resmed AirSense 10/S9 Hypoallergenic Filter - 12 packsDescription ResMed Airsense 10 S9 Hypoallergenic Filters. Filters are important to stop dust and allergens from entering the insides of the machine and to prevent them from getting ventilated through the machine. The Hypoallergenic filters from ResMed offer even finer filtering for those struggling with hay fever or airborne allergies. Feature One Year Bulk Supply: The 12 pack ensures you have a fresh replacement ready every month, maintaining peak