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Posted by HeatPro on February 11, 2005 at 19:04:01:
In Reply to: DIRECT VENT NOISE posted by jim on February 05, 2005 at 18:29:09:
It is probably a result of having the exhaust sound bounce between two walls. It might be possible to put an elbow in the outside termination run to send the sound one way or the other rather than directly at the neighbor.