"Note: If required, connect a bacteria filter to the device air outlet, and then connect the flexible tubing to the
outlet of the bacteria filter. When using the bacteria filter, the device performance may be affected. However, the
device will remain functional and deliver therapy."
Also....
"If the device is used by multiple persons (such as rental devices), a low-resistance, main flow bacteria filter should be installed inline
between the device and the circuit tubing to prevent contamination."