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sound proofing

buddymag00

buddymag00

Member
soundproofing ?

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hello all my first thread hope this to be the start of a beautiful friendship . love the site . have a 3'x3' grow space (inside a wardrobe with doors open and a board outside which doubles the size of the wardrobe. (will post photos to better explain later. i have a 600 w hps and im using a powerful in line extractor with a carbon filter. how can i soundproof or reduce the sound of my vent as it is circulating back into the room and can just be heard from outside the door. any suggestions would be gratefully appreciated.
 
G

Grass_Lover

Member
First off, you should circulate that vent outside of your room.

Its not good to vent hot air (air that mixes with HOT air from a bulb or ballast) into the same room that youre drawing air into your cab with...

Try hanging your blower by bungee cords.

Corners/turns create more noise
 
MTF-Sandman

MTF-Sandman

OG Refugee
Veteran
Is the fan motor or the amount of air the noise problem? What are the hood, fan and ducting sizes? The more back pressure there is, the more noise the air will make...
 
Deft

Deft

Get two birds stoned at once
Veteran
Whats a good muffler type setup? Somone should do a how too and add the thread to the link-o-rama by pontiac, somone who thinks they know how to build a good one.
 
clowntown

clowntown

Active member
Veteran
Smooth bored ducting, duct insulation, duct muffler, and sound-absorbing foam to line the walls would help.
 
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Deft

Deft

Get two birds stoned at once
Veteran
The mills pride cabs look like theyre made of compressed wood scraps with laminate right? That should be good for keeping sound from coming out of your box too.
 
clowntown

clowntown

Active member
Veteran
Yes I believe they're particle board and laminate. But that material won't absorb too much sound. You could line the "utility room" with sound absorbing foam.

http://www.icmag.com/ic/showthread.php?t=43385

McMaster-Carr said:
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Absorbers reduce sound waves and convert them into heat energy. Use absorbers in areas that have hard, reflective surfaces. The average amount of sound absorbed by a material is represented by the Noise Reduction Coefficient (NRC). The higher the NRC value, the more efficiently the material absorbs sound. A material with an NRC of 1 is the most sound-absorbing material you can get. NRC is calculated during testing in an acoustical laboratory.

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Barriers reduce sound by blocking sound wave transmission and reflecting sound waves back to the source. Use barriers in passageways to reduce sound transmission to surrounding areas or to divide an open area. A barrier's ability to reflect sound back toward the source is represented by the Sound Transmission Loss (STL). The STL is the difference between the sound level striking the barrier and the level of sound transmitted through the material. So the higher the STL, the better the barrier performs.
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Absorber/barrier combinations give you the advantage of two noise-control products. Sound waves pass through the absorber where they are converted into heat energy. Any sound waves that then hit the barrier reenter the absorber which converts those remaining sound waves into heat energy.
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Dampers reduce sound caused by vibrating surfaces. The damper material flexes slightly to convert vibration into heat energy so noise is deadened. A damper's ability to reduce vibration is represented by the Damping Loss Factor (DLF). The higher the DLF, the more the damping material reduces vibration and sound.
Click to expand...
 
buddymag00

buddymag00

Member
thank guys very good link dealing with soundproofing the box and the vibration of pumps and also the air flow. does the sound of the airflow change or disolve a bit over a stretch of ducting ie. distance of vent exit from extrac fan. i have a powerfull in line fanwhich is 4" sucking through a 6"carbon filter thats hung upright and exiting the box without duting>
ill try using bunjee thanks !
 
buddymag00

buddymag00

Member
:cool:
Grass_Lover said:
First off, you should circulate that vent outside of your room.

Its not good to vent hot air (air that mixes with HOT air from a bulb or ballast) into the same room that youre drawing air into your cab with...

Try hanging your blower by bungee cords.

Corners/turns create more noise
Click to expand...


thanks grasslover . my 4x4 box is in quite a big room and i have no out side vent option. will this size of a room sufice as the weather is quite cold thjs time of year . is the problem you see based on air temperature?
 
Ganja_Dragon

Ganja_Dragon

Member
As long as the temperatures in the cab remain reasonable (as little above 80 as possible), then you shouldn't have to worry too much. One thing you can do is buy some foam slabs (like the kind used for seat cushions) or some of convoluted foam mattress pads (check joann.com for those) to line your sound-reflective hard surfaces with. They'll readily absorb sound and I've made myself some mini-mufflers around fans with just high-density foam slab pieces and a cardboard box. The convoluted mattress pads will probably serve you better in a room situation, though. Just be sure to keep them, like everything else, away from your grow light and ballast.

Obviously, this will nullify your white paint, so you'll have to put some mylar on top of this stuff. Foam will darken with age and exposure to light and oxygen, so you'll have a second reason to use mylar. Painting over foam will just make it useless for soundproofing.

You can wrap your blower with foam slabs to muffle it, or just do what I did and set the damn thing in a cardboard box with appropriate holes cut into it and just pack it in loosely on every side with foam. A blanket will work, too, as long as it's a heavy one and you don't stuff it in tight.

If there's noise coming out of the vent itself, you can put a muffler on the vent's end. You can just get some chicken fence, wrap it around on itself so it matches your ducting size, and wrap some foam slab or a heavy blanket around that, leaving the end open.
 
Deer_Slayer

Deer_Slayer

New member
I have the same similar problem as you. The only noise problem I have is the air exiting my cab. Starting this weekend I am building a D.I.Y muffler. Check out this link http://www.icmag.com/ic/showthread.php?t=42646&highlight=duct+muffler for Treehuggers design. I am basically going with the same idea, except smaller and be using some filter material instead of insulation. Hopefully it should muffle the sound considerably, other then that my cab is stealth.


Heres another link with more muffler info http://www.icmag.com/ic/showthread.php?t=22113&highlight=muffler

If your having trouble with noise inside the cab, do what others have suggested. Wrap some foam around your fan and hang it by Bungees. Make sure its not resting directly against the cab or it may create vibration.
 
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clowntown

clowntown

Active member
Veteran
Yes, Dynamat is melamine foam. Why would you spend so much money on a stretchy version of melamine? Link to McMaster-Carr posted in linked thread for more effective materials in cabs, etc. (Unless you have a cab with rounded walls and other irregular, non-flat surfaces.)
 
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