Author Topic: soundproofing for air turbine  (Read 7789 times)

llvora

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soundproofing for air turbine
« on: April 12, 2012, 09:33:37 PM »
I have an air turbine mounted outside my house, and now that it's getting warm, the neighbors are wanting me to soundproof it. 
How could this best be done?  It's pointed out to the street, so the people who care about the noise are to the sides of it.  It's right under the eaves, so a box of some kind could be put around it, hanging from the joists that poke out into the eaves. 
I can't box it in completely, because it's pumping air in.
The sound doesn't seem to go around corners very well. 
I have some mass-loaded vinyl.  Also some quarter-inch foam. 

Randy S

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Re: soundproofing for air turbine
« Reply #1 on: April 12, 2012, 11:23:00 PM »
you will need to make an enclosure with baffles or turns to allow air to flow.
It would be best to contact us directly. You have the materials to make it right.


Randy S.
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Randy Sieg

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llvora

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Re: soundproofing for air turbine
« Reply #2 on: April 13, 2012, 12:38:06 AM »
you will need to make an enclosure with baffles or turns to allow air to flow.

Why would it need turns, since noise going out to the street would not be a big deal?  If I build a box around it with an opening on the street side, would that be enough?

Also, just as a short-term temporary measure, I was thinking of screwing a 2x2 onto a ceiling joist and screwing a curtain of mass-loaded vinyl onto either side of the 2x2.  That wouldn't be an enclosure, just a small barrier.  The 2x2 would be about 2' long, or maybe 3' if it poked out beyond the eave.   So it would be a 2' or 3' wide curtain that would be a few feet long.

Would that do anything to keep the noise from getting to the neighbor on that side? 

The reason I'm asking about a temporary fix is that I'm going to be very busy for a few weeks, I can't start a project of boxing around the fan, now. 

llvora

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Re: soundproofing for air turbine
« Reply #3 on: April 13, 2012, 02:55:52 AM »
Or are there other easy fixes that I could do in a couple hours or so, to reduce the noise, as a temporary measure?

llvora

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Re: soundproofing for air turbine
« Reply #4 on: April 13, 2012, 12:10:24 PM »
How about if I attached 2x2's to the eaves on either side of the fan, and attached a sling of mass-loaded vinyl to drape around the fan?  Then maybe inside the sling I could snug in sound-absorbent foam. 
Would this help significantly to screen out noise coming out to the sides of the fan? 
                                                                                                              Laura



Randy S

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Re: soundproofing for air turbine
« Reply #5 on: April 13, 2012, 03:17:36 PM »
you can try those methods if you would like, it all comes down to is it enough of a reduction...

sound is omni directional and therefore at the end of the enclosure would be the extent of the value.

Anytime you put something between the source and the receiver you can see a value of reduction...again, is it enough of a reduction?
Randy Sieg

Super Soundproofing Co
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888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

llvora

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Re: soundproofing for air turbine
« Reply #6 on: April 13, 2012, 06:03:15 PM »
Do you think it would make a significant difference, though?  Would it noticeably reduce the fan noise?  - giving me time to do the other things I need to do, before doing a proper soundproofing? 
There are plenty of things people do for soundproofing that are totally ineffective.  I don't want to waste time doing one of those things. 
Is this in the totally ineffective category, or somewhat effective?
thanks
Laura

Randy S

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Re: soundproofing for air turbine
« Reply #7 on: April 13, 2012, 06:18:10 PM »
I would not be able to put a value of reduction on that... Unfortunately, improper installation or material used in a system would be a complete guess...
I hate to be so vague, but even with a baffled system has a value of guess work and not an exact reduction value...

 
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

llvora

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Re: soundproofing for air turbine
« Reply #8 on: April 13, 2012, 07:39:50 PM »
Randy,
How would you go about doing the best possible quick job of soundproofing that fan - something that would be similar to the level of complication I was describing?  (dangling a curtain of mass-loaded vinyl from the eave, suspending a sling of mass-loaded vinyl and lining it with something)
I'm willing to buy materials for it, since I could reuse them later to do a good job of soundproofing. 
I just don't have a sense of how the materials work.  I have mass-loaded vinyl, but I've never tried it as a curtain. 
I have observed that the noise doesn't travel well around corners. 
The fan has a hum that's roughly middle C, and also white noise.  Probably the hum is most bothersome. 

llvora

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Re: soundproofing for air turbine
« Reply #9 on: April 14, 2012, 01:11:24 AM »
Randy,
Suppose I hung a framework made of 2x2's from the eave. 
What would you put on this framework, to make the best barrier?
Laura

Randy S

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Re: soundproofing for air turbine
« Reply #10 on: April 14, 2012, 03:02:08 PM »
can you send me a couple pictures of the unit. Here is my company e-mail.
randy@soundproofing.org

I will review and recommend your options.

Randy S. :)
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

llvora

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Re: soundproofing for air turbine
« Reply #11 on: April 16, 2012, 05:34:37 PM »
can you send me a couple pictures of the unit. Here is my company e-mail.
randy@soundproofing.org

Did you get my email?
thanks
Laura

Randy S

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Re: soundproofing for air turbine
« Reply #12 on: April 16, 2012, 05:37:26 PM »
Yes, and Thank you! I am reviewing them now and will let you know shortly. :)
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

llvora

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Re: soundproofing for air turbine
« Reply #13 on: April 16, 2012, 10:36:28 PM »
Randy,
If I hung a curtain of mass-loaded vinyl to the side of the fan, would it help to attach a 2" layer of sound-absorbing foam to the MLV, on the side facing the turbine?   
I could attach the foam to the MLV using duct tape. 
Laura

Randy S

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Re: soundproofing for air turbine
« Reply #14 on: April 16, 2012, 11:00:32 PM »
I replied direct to your e-mail.. lets try something cheaper. 2" cotton fiber panels.
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

 

anything