I've had my insert going a couple years now, and love it. Best thing I ever bought for the house! Recently, though....the fan has been rattling something wicked. I suspect it is the bearings, but hoping it is filthy with pet hair and dust. A couple times a year I have to clean off the intake screen of fuzz/dust./pet hair. If it's not out of balance due to crud and it is the bearings....I'm left with a replacement as an option. Considering this blower unit didn't last two years, I am not really wanting to put an exact replacement in. Perhaps they have improved the design since, but I doubt it. Has anyone had this problem and did you go with another blower assembly that is strong a blower and maybe quieter?