It seems a few people have have had this idea - this guy made one by taking a 2" pipe, perforating it, wrapping fiberglass around it, and then surrounding it with a 4" pipe. This will damp out resonance in the air stream by buffering the air stream.
#Low rumble and fog horn sound install
This is an incomplete idea, and I'm not sure whether or not it will violate code, but you can take a page from automotive engineering and install a muffler on the end of the pipe. So after installing 3inch pvc pipe the whole way from the water heater to the concentric vent and still being puzzled at the hum the contractor started going back over everything and after adjusting the combustion mix it appears the hum was caused by too lean a mix. Also the hvac guy that put it in has three ninety degree angles in the 2inch pipe before it goes into the 3inch which then goes straight outside. Based on the noise and feeling the vent pipe I think the standing wave is caused by the fan beating the air and there is minimal vibration on the vent itself. The manufacturer said they haven't heard of this. Further info: The fan is built into the water heater unit and as it is new and is controlled by the water heater cpu and I don't want to void the warranty messing with the fan is out. Has anyone come across this or have a solution? Total length of pipe isn't really an option as we can't move the water heater position though the length of where the smaller pvc pipe from the water heater exhaust joins into the 3" may be. I am fairly certain the issue is to do with some kind of natural harmonic happening in the exhaust vent and this is reinforced in that if you momentarily cup your hand over the vent exhaust (blocking the air flow) the hum stops and it goes back to the quiet expected noise for maybe 10-20 seconds, sometimes longer, depending on what the fan is doing then. It's low frequency and loud enough to annoy us in our bedroom on the second floor and most likely our neighbor. This noise is nothing like the fan noise close to the water heater. The issue is as the exhaust fan gets up to higher speed a loud hum starts in the vent that sounds a bit like a (albeit quiet) fog horn. The contractor that put it in used part of the existing 3" concentric vent from the furnace we removed used.
#Low rumble and fog horn sound how to
↳ How to Participate in the Delcamp Classical Guitar Forum.Never as bad as right after surgery, but I can tell you when we are going to have bad weather! Over the years, it has receded somewhat, but when the barometric pressure changes and all the traumatized tissue in my body complains, that high pitched sound really screams louder. He said that the membrane surrounding the brain that was disturbed might be slightly inflamed as it heals and is tugging on the auditory nerve in some way. I asked the doctor why this would be happening since they were near the olfactory nerve (transnasal approach), not the auditory nerve. It subsided a bit after I was home, but when I went to my follow up appointment, it was still pretty loud. Then in 2012, after brain surgery, I had a screaming high pitched sound like cicadas that while I was in the ICU, I could barely understand what people were saying to me. He said." no fog horn", and looked at me funny. I was walking there and commented to my husband on how I could hear the fog horn off the point. My first experience with tinnitus was a low frequency sound like the fog horn at Isle au Haute.
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