Orv,
Are you saying that this isn't a real problem. I don't want to seem ungrateful for the replies here, nor of the many hours of work in the design and build of this product, but our first 5er, although a SOB, never had this noise. The ducting under the floor of the living room seems to be made of some plastic material. I had to remove the grill to clean up after the grandkids stopped to drop some of their Goldfish crackers through the grill. ;-0
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