These are meant to be used for Dreamstation CPAP Machine in conjunction with the Respironics Reusable Pollen Filters The filter is housed in a blue frame that is permanently attached, and cannot be separated The Disposable filters are essential to maintaining your CPAP therapy by removing dust, pollen, and tobacco smoke particles from your CPAP air flow It is necessary for those who live in a home with a great amount of dust and those who live with pets The ultra-fine filter will ensure that the air you are breathing throughout your therapy is dust-free as possible With this filter, your CPAP machine is also protected against the dust so it runs longer