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Update... Removed a few wires so I could get the fan assembly completely out of the furnace. When I run the fan, it vibrates a little but not too bad. Until I put my hand/arm over the output. The...

A few weeks ago, my furnace blower got quite loud. So I removed the access panel to see what I could see. The fan blades were caked with dust... so I figured it was just out of balance. Pulled the...