I reported this to my service center at delivery (Feb build). I remembered the fan noise from the showroom Model 3 that appeared briefly in Dec 2017 and it was pretty quiet. The SC told me I was right, and they lubed the fan. It's pretty quiet now.
The noise I was hearing was not just the air coming thru the vents; it had a more abrasive mechanical sound to it. I have no problem with the normal whoosh of air coming out.