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Try a notch

Posted by Dodgeman on May 3rd, 2000 12:52 PM
In reply to Humming from Waste Pipes by Chuck Anderson on May 2nd, 2000 05:48 PM [Go to top of thread]

Assuming the stack is made of a material you can easily cut, try putting a notch in the top edge. The notch should be 1" deep and go half way around the pipe. In other words, cut half way through the pipe 1 inch down from the top, and then cut down from the top one inch in two places to remove the piece. This notch will "break up the wind as it passes over the top of the pipe, and stop the noise.

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