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I've created an Accidental Trombone from my water heater vent piping
DIY guy here who just installed a new Westinghouse 50-gallon water heater, model WGR050NG076. This is the same as the HTP PH76-50. I used 2" PVC piping for air intake and vent from my basement, and sideways through the concrete wall and venting on an outside wall. I inadvertently created a trombone. The water heater fan is on a resonant frequency that causes a low frequency rumble that can be heard throughout the house, and outside in the yard.
Here is a link to a 1-second video of the outside vent. You can hear the noise in the video.https://goo.gl/photos/Ma5VWEWywwKHwiks7
Here's a link to two photos, showing the PVC piping inside and outside the house.https://goo.gl/photos/14TLmnnnY9gWqi9e8
I'm looking for advice on how to get rid of my accidental trombone. Thank you!