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edited Apr 13, 2017 at 12:22

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If you think it is harmonic resonance, changing the length or diameter of the PVC pipe can help stop it. Refer to this prior question for more details: How do I prevent harmonic resonance hum in PVC vent of newly installed hot water heater?How do I prevent harmonic resonance hum in PVC vent of newly installed hot water heater?

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created Oct 16, 2014 at 13:39

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If you think it is harmonic resonance, changing the length or diameter of the PVC pipe can help stop it. Refer to this prior question for more details: How do I prevent harmonic resonance hum in PVC vent of newly installed hot water heater?