These Ultra Fine Filters are made of Polyester fibers in a plastic carrier. They are compatible with all DreamStation CPAP & BiLevel machines.
 
USAGE: These filters are disposable and should be replaced after 30 nights of use or sooner if they appear dirty. To install an ultra fine filter in your DreamStation, slide the foam pollen filter out of the machine, securely snap the ultra fine filter onto the base of the foam pollen filter, and insert them both back into the device. For complete instructions review the documentation that came with your equipment.