The blower fan on our Regency Hampton HI300 went from an occasional rattle to a constant and loud whine. I saw some posts on this website where some users indicated that the "lubricated" the ball bearings. I purchased some "3 in 1 Oil" but don't know what I am doing. Any suggestions? If I need to replace the unit, are there any suggestions for where to purchase? I noticed one website claiming to have the OEM. Amazon has replacement units. Thanks for your help!