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Old 05-15-2009, 02:53 PM   #1
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Splitting 1 register to 2?


I've got one supply register in my master bedroom, it gets quite a bit of air velocity because it is only about 4 feet from the AC system in the attic. This can be quite noisy and I like my AC to run without catching my attention. I'm thinking about splitting it from 1 6" duct to 2 5" ducts and adding dampers. Any problems with this?

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Old 05-15-2009, 05:03 PM   #2
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Splitting 1 register to 2?


Not an HVAC guy, but FWIW,
at best the new ducts will reduce airspeed 30%. Maybe the perceived noise level will drop more than this.

Re: 4 feet, adding internal duct vanes may reduce noise due to air turbulence.
This
http://www.faqs.org/patents/app/20090036047
claims to tune the system for reduced noise, I guess much like an auto muffler is tuned to cancel out noise at some freqs.

This one
http://www.faqs.org/patents/app/20090098818
is hard to read but seems to claim it can "straighten" air flow with vanes.

From the Web, looks like dampers increase turbulence, but maybe I should have said, "Sounds like dampers increase turbulence."

I guess an auto A/C system almost always equals a poor ductwork design/install because the auto marketing people define the overall auto internal geometry and leave it to others to reduce the auto A/C noise level, so I'd look into auto A/C designs for solutions to problems like this.

Here's another option
http://www.acousticalsurfaces.com/hv...silen.htm?d=26

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Last edited by Yoyizit; 05-15-2009 at 08:27 PM.
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