REMstar CPAP Filters & Replacement Parts

Clean filtration is the quiet backbone of good CPAP therapy. If you use a Philips Respironics REMstar machine, keeping fresh filters in place protects both your airway and the motor inside your device — trapping dust, pollen, and airborne particles before they reach the air you breathe all night. This collection gathers the replacement filters and foam inserts that fit the REMstar family, so your machine keeps running quietly and efficiently.

Two filter types work together in most REMstar units. The reusable gray foam filter handles larger particles and can be rinsed and air-dried, while the disposable ultra-fine filter captures the finer irritants that trigger allergies and congestion. Our Philips Respironics REMstar M Series Ultra-Fine Filters (1035442) fit popular models including the REMstar Plus, REMstar Plus C-FLEX, and REMstar Auto A-FLEX. Pair them with the Spirit Medical Remstar Foam Filters (CF-1005964-1), a washable 3.5 x 1.5-inch reusable option, or the AG Industries UltaGen Medical Foam CPAP Filters (AG5964) for a compatible foam alternative.

How often should you swap them out? A good rule of thumb: rinse the reusable foam filter weekly and replace it about every three to six months, and change disposable ultra-fine filters every two weeks to a month — sooner if you have allergies, pets, or a dusty environment. Living in a dry or high-particle setting tends to shorten that window. Watching for a graying, clogged, or torn filter is the simplest cue that it's time.

Using clean, machine-specific filters helps maintain consistent air pressure, reduces motor strain, and keeps your therapy comfortable. Confirm your exact model before ordering, since the M Series and older REMstar units use different filter shapes. If you have a newer device, browse our dedicated PR System One REMStar collection for filters and parts matched to that generation.