I ended up ordering three of these from Amazon; sequentially. When the first surfaced the fan was out of balance and when it reached full speed the sound was like that of a 747 taking off. Heavy vibration and noise. So I thought I must have gotten a bad one. Then I ordered the 2nd one and it had the same problem. Doing the math three times was a charm, I tried again but the third time was just as bad. So for another $10 I ordered a complete heater, vent and fan unit. The heater that comes with this one has a different mount to turn the fan shaft. It worked well. I suspect these replacement heaters could be factory faults that someone received and is selling through Amazon. It's certainly not a new style (fits exactly like that) as it comes with a full block brown.
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