Used with DeVilbiss Pulmo Aide AC Compressor or Nebulizer (code 5650D) and Devilbiss PulmoMate Compressor or Nebulizer (code 4650D), the filter should be changed once a month or when the filter turns gray in co This is a Long Life Air Inlet Filter which should be used with DeVilbiss Pulmo Aide AC Compressor Or Nebulizer (code 5650D) and DeVilbiss PulmoMate® Compressor or Nebulizer (code 4650D). The filter should be changed once a month or when the filter turns gray in color.