Super Soundproofing Community Forum

Soundproofing Forum Topics => Soundproofing Generators, Pool pumps, Engine and Dyno rooms => Topic started by: llvora on January 08, 2012, 12:39:07 AM

Title: hum from air turbine coming through stcture
Post by: llvora on January 08, 2012, 12:39:07 AM
I mounted an air turbine outside my house, under the soffit.  It's sitting on a wood platform, which is suspended by chains from a ceiling joist.  The wood platform rests on the exterior wall. 
A hum is coming through to inside the house.  Frequency roughly middle C, I guess.  It's not loud, just audible.  Before I mounted the turbine, I wasn't hearing the hum.  So maybe it's being transmitted by the contact of the wood platform with the wall, or possibly through the chains. 
Maybe I'm just hearing the hum now, because it's closer to the window than when it was sitting on a chair.  I tried putting a piece of cardboard between the wood platform and the wall, and it didn't reduce the hum. 
I mounted it with the platform resting on the wall so it would be less likely to get rained on, if rain slants in on a high wind.  Also with a little pressure on the wall because I thought it might knock around and hit the wall in a wind, otherwise. 
So I'd like to isolate the turbine noise without re-mounting it further from the wall.  How could I do this? 
thanks
Laura
Title: Re: hum from air turbine coming through stcture
Post by: Randy S on January 10, 2012, 06:59:12 PM
ok use this product to break the connection on the chains, check for weight limits.

https://www.supersoundproofingsales.com/prodinfo.asp?number=09-00002-HANGER

then you can use this product on the edge of the platform to keep it from touching the wall.

https://www.supersoundproofingsales.com/prodinfo.asp?number=09-42745-BS-3%2F4

The remaining noise will require more mass on the wall to block any sound coming through the wall.