So there's a venturi between the two pressure sensors? There would be a change in pressure due to that, and from the two pressure readings and the known diameters on both sides I can see how they might get the flow rate. Interesting.
It seems to me that a couple years ago or so I read something about CPAP machines using a low-inertia flow rate meter. Maybe Respironics does it that way.
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A little late to the party, but one option to remove moisture is rice. Put the unit an rice in a large sealable bag and let it sit for a couple of days. This is one method used to dry out cel phones. If it is an odor (and not from mildew) trying putting the unit in a sealable bag and include a one to two cups of unused coffee grounds (the cheaper the better). The coffee will absorb the odor (works quite well for cigarette smoke).