I been using large styrofoam shipping containers they are 4" thick used for shipping animal/reptiles and really quiet down the fans just use a knife and cut a hole for your intake/exaust and they square and they stack nice in a corner or whatever I'm sure you can get them free at the pet store.... free nice clean

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Play safe

Great solution!!

I was considering lining the walls of my room with insulation board. Like they made walls out of in the seemorebuds video. Any tried this yet?

The best thing that i have come across for sound is the lagging that is put around pipes its like a spongey kind a thing great stuff i put a piece on each sides of my fan and hung fan wit a bungy clip with a rubber o ring no noise at all comeing from my fans.I even put the lagging in strips about 1ft sections under my hydrophonics it's cut the noise of the pump down bt 90%.Anything that you have to hang use rubber o ring like the ones from time ago what used to run in a hoover old timers will know what i mean.

Yo guys i had a really long room, about 14 feet long and 10 feet wide. I built a wall and made a 5 foot wide closet, cutting the room down to 9x10. I put sound board up against the walls (each sheet is 4'x8' and $11 at home depot)and a sheet of drywall over that. Did the whole inside of the closet for less than $100. The most expensive part was the door which was $120 and soundproof. But you can't hear shit!

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I am more afraid of an army of 100 sheep led by a lion than an army of 100 lions led by a sheep.

Damn! That sounds (I mean doesn't sound) nice.

I tried putting up some flat insulation board. It sucks at retarding sound. I should have done what you have done. Oh well back to Lowes.

Nice setup..

And to the OP, thanks for that information. That will help me with my future grow and keeping the noise down.

at day turn your radio on! at night is ventilation off!!!! problem solved! LOL!

I have dehumidifier running next to my grom room. You can hear it running, and you can see it running, and you don't hear everything running behind it.

Forgive me if someone has already said this (its a long thread, gimme a break) but I plan on insulating my entire box, because it's small enough. This, if it works, since right now its just an idea, will hopefully make the HPS, fans, and air pump undetectable. It makes sense to me, because the sounds/vibrations would have to go through another layer, insulated, to get to outside the box, then add my closet doors, and if all goes to plan, there won't be any detectable hum or noise. Just a thought.

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Micro Closet Growbox under construction