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1

To go along with gregmac's very good answer I would offer the follow tips. Make sure your rigid duct is ultra secure, especially near the fan. If it wiggles when you grab it then it will make sounds with the fan going. I strap these things in really tight. I rockwool the first 3-4 feet really tight. I smash it in around the duct. This absorbs much of ...


7

There more restricted the airflow is, the more noise there will be. All contributing factors to noise: Diameter of duct (larger is better) Overall length (shorter is better) Number of turns/bends (fewer is better) Radius of turns (larger is better) Size reducers used (no reducers is better) Type of duct (smooth, rigid is better than flexible) Type of ...



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