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Posted by mark on December 17th, 2002 03:44 PM
In reply to Duct Noise by AMB on December 16th, 2002 02:47 PM [Go to top of thread]

It also could be not enough or restricted return
air capacity. The return duct is compressing itself in when the blower comes on. Check all the
returns for blockage. (e.g. furniture) Also, if it
is the return duct, take a large screwdriver, find
out where the duct is sucking in, and make large
X-shaped scores on the sheetmetal.

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