ResMed CPAP filters remove dust, allergens, and other airborne irritants from your therapy air before it’s delivered through your tubing and mask. The size of ResMed filters varies depending on which machine you use, so check the product name and description before ordering. Like all filters, CPAP filters for ResMed machines need to be replaced every 30 days to ensure optimal therapy. We have filters in packs of two or three, as well as bundles including standard tubing and cleaning wipes if you want to stock up on the essentials. Order filters for you ResMed CPAP machine at CPAP Supply USA with free shipping over $49.