Wow glad to see this thread has come so far..

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this is my method for the internal fan and the ceiling mounted extractor fan.

i simple suspend the cage fan in mid air with string inbetwean the lights and the top of the plants to reduce vibration noise.

for the ceiling fan i dont screw the fan directly into the ceiling i drop the air duct down into the grow room, attach it to the fan and suspend with string again, this cuts out nearly all the noise as before i did this it was screwed direct to the ceiling and it sounded as if there was a plane taking off in the room lol, hope this gives some people some direction and ideas for their own grow space, good luck n keep it quiet, ur equiptment and ur lips, lol. peace

Depending on the size of your room... Whats called " Muffin" fans can sometimes do...
I manage to get a few 4" and 6" fans..

I used the 4" for while but found the started to get a bit noisey for my liking.. so went to change them the other day for the 6" ones.... turned them on (dimmer switch included) and the room nearly took off...
So now back to 4" fans but this time mounted them to foam using a hot glue gun and then to a piece of half inch mdf screwed this to the wall of my grow room but also using rubber bands wraped around screws between the wooden plate and my room..
The result... Silence.. Cant belive how well it works... The hot glue works really well...

silncers work a damm treat! Got a 130w fan with 2 silencers on it. Upload pic soon. Only prob is,it's still a little to noisy for my likings. Any body know how i could silence it more? Was thinking of putting up a fake wall to reduce noise but don't know what to use as insulation? What has great sound deadning properties?? Any and all help is appriciated!

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The noise now you can probably hear is coming from the actual fan, If I were you I'd make a box for it and fill it with expandable foam.. he foam sets hard so if your not happy with it you can take it the box apart and peel off the foam..

cheers! i'll give it a shot. Don't know if will work caus room is a bit tight.can't suspend either. Does anyone know if another silencer will work? Thought it won't caus not connected directly to fan so therefor won't silence. Any one know if true or not?

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Playing around with cheapest option first.Insulation bats. Let ya know if work or not...

I'm open to all any any idea's

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ok. insulation bats worked a little but not as much as hyped to be. I can say the same for insulated ducting. I am running r6 ducting throughout. Yes it helps but not a great deal. Well in my circmstancs anyways. But as always it all comes down to individual set ups.

With the box idea...Is it better to go thick walled i.e 19mm part board and have less foam OR go thin like 3mm and more foam? And i'm guessing to bigger the box the better. BUT having said that,do you comprimise noise when the box touches the walls? (refer to my pic above)

All info is greatly appriciated

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I to am about to face the challenge of nice quiet no sounding fans in my room.
I thought of this.Get some thin chicken mesh.squash it all up and make a seperate piece of ducting about 3 or 2 foot long 2 or 3 of these things would be the go.put as much chicken mesh as you can in there without putting holes in the ducting. i was going to reinforce ducting with strong tape.Then i was going to make 2 seperate boxes out of ply use that dynamat car sound deadening stuff to line it heavliey and then cut the holes out to feed the duct threw then put it all togther.Couple of hooks and suspend it from my roof in my room.

the hole chicken mesh idea is to take up room in the ducting.While still letting airflow fly stright threw thier.In other words walk into a empty house it echo's its ars of walk into a house that has furntiture it dosnt really echo.Thats kinda were i got my idea from lol

the thicker the better i would say with the wood and a shit load of foam.And yes if your fans are touching the walls i could only imagine that ther would be vibration from that when running. foam it up