Author Topic: Sound proof community pool machine room  (Read 2922 times)

stobit

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Sound proof community pool machine room
« on: May 15, 2014, 12:49:30 AM »
I am in local San Diego, CA. My community pool has a noisy machine room located only 6 fts from my apartment. The machines (filters, pumps, boilers for spa, etc) run with their full speed 24 hours 7days week and never stop. The sound of those fast rotating machines comes out from the ventilations on the side wall and front door of machine room to my home. (see attached pictures) The machine room is quite aligned with my home therefore my patio/bedrooms/family room/living room all suffer from the sound from machine room.

Finally HOA board agreed me to add soundproof to that machine room.

Do you have any suggestions to do the soundproof of that noisy machine room with ventilations ? The wall of that machine room can totally isolate that sound but most disturbing sound come from the vents on the wall and door.

According to my research, I am thinking to add soundproofing material on the wall such that the sound can be absorbed somewhat before they come out from vents.

But how to deal with vents. It that possible to add barrier inside the room between vent and machines, thus that air can flow but sound cannot go straightly out. On the other hand, can we add come vent cover that has sound absorption inside?

I noticed your company is also at San Diego County. Do you also provide soundproofing service?



Randy S

  • Senior Soundproofing Technical Specialist
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Re: Sound proof community pool machine room
« Reply #1 on: May 15, 2014, 05:00:25 PM »
Ok you would need to add mass and absorption to the room itself and use baffle boxes over the vents.
Give me a call direct and we can discuss how to go about the project and we can refer contractors to install.

Look forward to hearing from you.

Randy S.
760-752-3030 ext 104
Randy Sieg

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

stobit

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Re: Sound proof community pool machine room
« Reply #2 on: June 05, 2014, 04:59:41 PM »
Hello Randy,

Base on your suggestions, I am looking for some soundproofing vents sold as a product and ready to install directly.

something like this: http://rts.vents.co.uk/blog/?product_categories=aircore-and-airliner-sets/

but I didn't find any in the United States. Do you sell anything like those shown in the link? this is so-called acoustic ventilition (which can circle air at the same time has at least 30dB reduction of noise, that can perfectly solve my problem by just replacing the old regular vents grill with the new integrated one)

I think in their product, they add sound damping materials and a fan to pump air.



Thanks


Ok you would need to add mass and absorption to the room itself and use baffle boxes over the vents.
Give me a call direct and we can discuss how to go about the project and we can refer contractors to install.

Look forward to hearing from you.

Randy S.
760-752-3030 ext 104

Randy S

  • Senior Soundproofing Technical Specialist
  • Global Moderator
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  • Posts: 777
    • Super Soundproofing Co
Re: Sound proof community pool machine room
« Reply #3 on: June 05, 2014, 05:15:38 PM »
No we do not sell anything like that, however the baffling formula remains the same.

If you google "baffle box" you will see what looks like rat mazes for air flow and noise reduction.
We sell the material to line the system.
Randy Sieg

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

stobit

  • Guest
Re: Sound proof community pool machine room
« Reply #4 on: June 06, 2014, 11:32:14 PM »
Hello Randy,

Thanks for your comments.

There are four vents on the wall of that pump room, two vents on the front door of pump room. almost 90% of noise comes from two pump motors. and all of the noise comes out of the room via the 6 vents.
the picture of pump room and pump motors are shown in the link


https://plus.google.com/u/0/photos/112280331465909098767/albums/6021959873154783905#photos/112280331465909098767/albums/6021959873154783905/6021959873061968754?pid=6021959873061968754&oid=112280331465909098767

https://plus.google.com/u/0/photos/112280331465909098767/albums/6021959873154783905#photos/112280331465909098767/albums/6021959873154783905/6021959887330905858?pid=6021959887330905858&oid=112280331465909098767

https://plus.google.com/u/0/photos/112280331465909098767/albums/6021959873154783905#photos/112280331465909098767/albums/6021959873154783905/6021959874435164194?pid=6021959874435164194&oid=112280331465909098767


originally I am thinking only to cover the source of noise, two pump motors, but there are lots of pipes coming into and from the pump as shown in the picture, and it is hard to make a box to cover the motor inside.

Then I am thinking, as you suggested, adding sound baffler to the vents because all the sound get out of the room via those vents

If there is not any ready-to-go sound baffles/acoustic vents sold. Is there any contractor you can refer in San Diego who can costermize vert soundproof baffle box?

Thanks a lot

No we do not sell anything like that, however the baffling formula remains the same.

If you google "baffle box" you will see what looks like rat mazes for air flow and noise reduction.
We sell the material to line the system.

art noxon

  • Guest
Re: Sound proof community pool machine room
« Reply #5 on: December 06, 2014, 03:18:22 AM »
Sounds like a Fun Project

Pumps and therefore pump rooms need ventilation so they don't overheat. 
Vents and soundproofing don't go together very well.

There are two types of noise source in the pump room.  1) the pumps 2) room reverberation.  In general, for bare rooms, the sound level due to reverberation is easily 10 dB louder than the noise from the pumps at the openings, unless the pump is close to the opening. 

Add sound panels to the room that are thick enough to absorb the full range of sound put out by the pump.  If the room is 12x10 by 8' high, we have 1000 cuft volume and the room constant is 1000/20 = 50 Sabine seconds.  The room has a surface area of 600 sqft and an absorption coefficient of maybe 5%, for a total of 0.05 x 600 = 30 Sabines of absorption.  The room has 50/30 = 1.7 seconds of reverb time.  A dead room has less than 1/2 second reverb time.  For this room to have 1/2 second RT60 you need total of 50/0.5 seconds = 100 Sabines (sqft of 100% absorption).   You have 30 already so buy 70 Sabines of probably 2" thick sound panels.  Each panel is usually 2'x4' = 8 sqft.  You need at least 9 of them.  Couple extra won't hurt.  Distribute them on walls and ceiling.  Should cost maybe $8/sqft, or 70 x $8 = $560 to $600.  Buy 2" Air Conditioning Duct Boards in 4x10 sheets, two of them will do, cut them down to size.  Don't breath fiberglass dust.  Spray paint any cut edges.  This part of the project will cut the room gain problem down to a practical minimum.  Noise reduction is 10 Log 70/100 = about -5 dB. 

Next build large, loose fitting, open ended dog houses that will go over each pump.  You want one that slides easily on the floor over or away from the pump.  It is open at both ends.  Add 2" sound panels to inside the dog house.   Now you've blocked and absorbed 2/3rds of the noise being dumped into the room (-5 dB) and more importantly, hopefully blocked the line of sight sound path between the pumps and the louvers. 

Next make a large panel out of plywood and add a 2" sound panel to both sides of it.  Make the panel about 1' bigger on all sides than the louver opening.  You want to mount the panel away from the wall so air can low around the panel into and out of the louver.     Calculate the minimum amount of air flow at the edge of the panel by dividing the open area of the louver by the edge perimeter of the panel.  Typically the panel will have 6 to 8" air gap to the wall.  This is also good for about -5 dB.  Total job is -15 dB and what is also good here is that you've muted the noise, caused it to not be clear, more like a distant hum. 

Remember you can never get rid of sound.  You can only reduce it enough that it will hopefully get lost in the noise floor.  If not, raise your own noise floor help cover the intruding noise.  Nothing is better than an old fan, fish tank or a modern gurgling water feature. 

Art Noxon
Acoustic Engineer