Wouldn't changing the air flow setting be easier? I find that for a few minutes when first starting up my cold I-Pace, the same whining sound is heard, but it disappears once the ducts/fan/car warms up and the climate system throttles back the air flow to more leisurely levels. I believe it to be a simple resonance issue at that particular fan speed and temp.If changing inlet size/ form would get rid of the whine I would be happy. Easy to test by putting a fine mesh over the intake and see what happens.