Another way to reduce fan noise is to use rubber feet either side of the fixing plate and screw through them, using a suitable washer on the screw head side.

Also car acoustic deadening rubber will help with general vibration. Not sure if I'd put it in a tank, but underneath on the floor it should help. Example: eBay Store - Sounds Great: Dynamat Cascade: 10115 DYNAMAT Original 2-Sheet Speaker Kit Brand New

Also beware of corners in a room, these act like a trumpet and increase noise. If you can mount fans / ballasts away from wall and ceiling corners, or 1/3 way between small walls this should help.

John - ballasts will make more noise over time, if your's is a few years old, it may be worth replacing. Try mounting it on rubber feet, or a foam/ rubber base and aim your circulating fan towards it. A high density foam block, like a yoga block should help.

great info im adding an inline fan 8 inch to get rid of the load ass box fan...i dont want to even show the pictures of that rig up.. LOL +rep for thread

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Check out my Cfl' flouro mix grows Journal..http://www.rollitup.org/grow-journal...t1615035:hump:My Strawberry Haze http://www.rollitup.org/grow-journal...aze-3-g13.html

im sure if you build a good box that has vents and fan(s) you could handle this heat issue. i will make up some plans for a box and throw them on here tomorrow..

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ring ring ringa da ding bro....lmao im to high,

i can't stop thinking about the fan box i'm gonna build once i get my winter crop growing. i love this idea, still.

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i'm the guy i've always wanted to be

the fan/box doesnt get hot running all the time?

nope.. the fan cools itself

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Ok cool. I was thinking I'd line the inside with foam and put a pc fan on each end. Then rubber feet on the outside.

Medi user- I would be willing to bet that is the problem. Ill build the box for now and when funds allow i will invest in a new light set up. I have been meaning to jump to a 1000 watt anyways.

so is it worth doubling the box? since your forced to buy an 8'x4' anyways? or is a one layerd box enough?

Go for it if you want john, but putting fans to cool off a fan really isn't necessary. The air flows through inline fans and cools itself.

People used to use these boxes around inline fans on the old overgrow site. I never tried it personally though. Heard good comments about it back then, and continue to hear good things now.

Aw man. You totally beat me to it Medi. I was going to suggest the car sound deadening equipment, but looks like you beat me to it. My only suggestion would be to switch from Dynamat to Fatmat. It's cheaper and still works.

I personally don't have experience silencing a 'room' per say. I really have much more experience quieting a grow box. With boxes, it's an issue of reducing the sound, while at the same time saving on space. But I'm willing to offer whatever info I currently have.

Other than people mentioning the rubber feet, sound dampening material, bungees, and boxes, I do have a few ideas.

The carbon filter itself helps reduce noise from the fan, so if at all possible put it at the end of the fan's path. If that doesn't work, or isn't an option, try using a duct muffler. But I use insulated ducting. You'd be suprised how much noise that reduces just by itself. Also, as far as the fan goes, you can always use a Speedster to reduce the amount of air that is flowing, reducing the noise.

I look forward to seeing where this thread goes. Anyone have any experience silencing a cab? I got most of it done, can't get rid of that 'wooshing' sound and it's currently pissing me off.