My dealer gave me a new fan and motor to replace the noisy combustion fan in my Afton Bay. I'm thinking this is some aftermarket thing, since it doesn't have the St Croix part number on it, and lacks the isolation bushings that seem to be OEM. I bench tested the new one, and it vibrated as badly as the old one. Having nothing to lose, I decided to see if I could balance the fan by removing some metal from the heavy side. It seems to have worked. There is negligible vibration now on the bench, so I expect it will run smoothly in the stove. I used my trusty Dremel and a milling bit to chew at the fan base: It does have a Fasco motor, sealed bearings. Now that I have the old one quieted down, I'll just wait to install this one - although my curiosity may overcome my inertia and force me to put this one in the stove to see what happens.