Why do I hear a blowing noise even after AC turned off? on 2008 Lexus LS460

I've noticed lately after turning off my AC I still hear a blowing noise coming from the passenger side. Is this normal?

Asked by for the 2008 Lexus LS460
Check to see if the seat cooler fan is running. The control is on the mounting between the seats. This fan does make a quiet but distinctly audible sound.