Fine air filters for the DeVilbiss Blue apnea machine. Fine air filters are available in a pack of 4 pieces. These filters help prevent pollen and other small particles from entering your apnea machine. DeVilbiss recommends that you change this filter after 30 nights of use, or earlier if it is dirty. Note that these filters should not be cleaned – they should be discarded and replaced. The air filters come in a pack of four and therefore a pack will last up to four months.
