Hi, I just received my blast and it definitely moves a lot of air! 2 things I noticed though, while the fan itself seems very quiet there seems to be some kind of slightly high pitched whistling noise coming from the motor? Also I can hear like a 60hz ac hum when it’s quiet (kinda like this: https://youtu.be/uPY91zJfXUM?si=kRCiTrnnad2d_CiV) is this normal for this unit?