These disposable ultra-fine filters are made of polyester fibers. These filters are compatible with all DreamStation 2 CPAP & BiLevel machines. The ultra-fine filters are an optional accessory for increased filtration efficiency.
To install, 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 machine. Further instruction is available in the user manual that came with the machine.