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Thread: Furnace fan
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Old 02-02-2018, 12:29 PM   #17
Miramar Owner
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Brand: Thor Motor Coach
Model: Miramar 34.4
State: Iowa
Posts: 638
THOR #4488
My furnace fan used to make a lot of noise too. I found the problem to be the outside furnace cover was vibrating and the sound resonated throughout the duct system. I always look for easy and free solutions first. I tightened a couple of screws.
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