Hi all...
I've built myself a sealed room ( 2.2m L x 1.8m W x 2.3 and 2m H ( Angled ceiling ) . Its pine frame with plaster walls ( single inside lined, although I might put insulation on side where fan is..... for noise )
I'm going to run 2 x 1000 MH ( 2 plants ) . Ventilation will be coming from a centrifugal Allvent 310 ( 420L/sec ) along with a Can-Fil 66 for odor control. Will leave the fan on the concrete floor and run duct up the wall into highest corner and draw hot air down and out through filter. 2 Sunon PC fans in opposite corner ( top and bottom ). Lower for cool air and upper to push warm air around wall to duct . I'm a sparky, so all my timers, variac and what not are looked after ( not yet wired in )

My fan is none to quiet but putting a speed controller will help it along i'm guessing

My main questions are these.
1) Does the accoustic ducting have much effect on noise and how effective are silencers ?
2) Is mounting it on rubber feet the best idea and wrapping it in the white shit that came with the filter worth it ?
3) Is there a quieter fan with same performance as my current unit.

Noise is crucial as my neighbour can here me fart, so i'm guessing my fan will sound like a jumbo jet to him, as I tested it out the other day just on its own ( direct on concrete at top speed with ducts on, but no filter attached ) If need be, I am able to swap it from where I bought it.
I have all the hardware , but setting it up isn't as easy as I thought, and all my mates are useless lazy pricks who's' setups aren't worth copying.
Any critcism or advice/help is very much appreciated as it saves me doing this shit twice.
Cheers

Yes mate silencers do work to a degree, they are not totally silent i can still hear the noise of the fan through a closed door. (Although it sounds then like a tumble dryer) i have a rvk 150L and the silencer to match its still fecking niosey but no where near as bad as without it. You might want to have look around for some of the more expensive acoustic fans, they are meant to be really quiet, but not used one so could not tell.

As for mounting try suspending the fansilencer using bungee cords if poss this helps with the noise reduction.

Have a look around to see what other fans are out there and how much you want to pay......

Speed controller does help too, however if you really the air moving at x rate then turning down the fan will decrease that rate and therefore you could have problems with getting the right amount air in/out.
I use a fan controller on my grow and i find there are times where i really need the fan on fullpelt.

Anyhoooo. keep us informed of the grow and some photos would be welcome

SS

hey up stinky welcome to the site mate hope you enjoy.Any way i found a top way of keeping the noise down on my fans all you do is wrap your fan in a binbag put it back in the box it came in tape up all the joints stab a hole in the box grab a can of expanding foam an fill the little mother fucker up. Not forgetting to take out the power flex 1st the just cut out the front an back and cos you put it in a binbag you can take it out brake off the foam really easy an its as good as new hope this helps good luck with ya grow matey leepy

Looking good mate.

Really you'd want your carbon filter in the room (much more effective sucking through)

I wouldn't leave the fan on the floor, just suspend it from the ceiling using bungee cords, mine don't make any vibration noise, they're not boxed in or anything. I think it's about getting the correct tension on the bungees.

Acoustic ducting is excellent, much better than the other stuff.

I'd also use a proper in line fan for the intake, PC fans are naff IMO.
Is your grow space in a cold place, i'd worry if that fan will have enough umph to cool 2x1000w

Where does your air extract to???

There are 3 types of noise that I can think of with regards to this; rvk motor noise, vibration noise and air flow noise.

Wrapping ducting in acoustic insulation and using a silencer does help with air flow noise. With my drobe I do not notice much air flow 'whooooshing' noise coming out the back anymore.

Use the technique for putting your rvk in a box with foam as mentioned above and that will reduce the motor noise.

Suspend the rvk box on bungee cords to reduce vibration noise. or if you have to keep it on the floor, try diff foam type materials to see which is best (or a combination).

Nice room, fancy knocking one up for me?

Yes acoustic ducting is worth every penny. Works very well with fan controller so you can make it quieter at night time etc.

Hang your fan and filter from some bungee cord.

Remember the fan is very quiet it's the air moving that makes the noise and any vibration.

Get rid of the PC fans and get some proper ones those lights are very hot. You can hang them from the ceiling to save floor space.

You may want to insulate the floor as the pots will get too cold on a concrete floor.

Good luck, do a diary.

Thanks fellas...
Leepy...Going to try your method tomorrow. Fomofill ( what they call it here ) pops bricks out of walls. Will be interesting to see how it goes in a cardboard box.

KC33...The growroom is in my shed, which is tin and gets fuckin hot in summer ( now ) and thats where the air extracts to. The shed itself is huge with plenty of space for air to dissipate.

Doc...The PC fans are actually 240v electrical cabinet cooling fans I hocked from work. I actually found that I am using accoustic ducting. My mate who's an aircon mechanic popped over and did some sums and tells me that negative air pressure will make the fan noisier as well and to also put recirc fans inside the room as well.

Looks like I still have a bit of work to do. Thanks for the input fellas, as its muchly appreciated. I will definitely be running a diary and sharing my journey with you all.

Cheers
Stinker

Now that's interesting. I presume that's from the motor working harder? I've always thought neg pressure was necessary, did he say you need to equalise it or something?

Interesting. So the negative pressure will be dragging the fan inward creating more rotor friction?

Hello Stinker

Where is your intake coming from? if it's from the shed where the air is expelled to then it will cause problems, as all the air in there will be severly depleated of CO2

Best of luck with getting it soundproof though. How close is the neighbours property to your shed? Just the exhaust air would be loud enough i'd imagine.

Shed growings gotta be real stealthy!

Sorry have to disagree with that, an rvk fan is loud.

Mine seems real quiet so far, both of em to be fair, just the whooshey noise is loud. Hmm, maybe when they get old they get noisy?

yeah the rvk is quite loud, too loud for a really grow, but if the fan is insulated in a box and hung on bungees as mentioned by Leepy then all i can hear now is the whoosing sound of the air sucking in through the cf. I've also put a silencer after the fan and now i can hardly hear any noise coming out, just air.

cheap version.......works well
http://www.uk420.com/boards/index.php?show...mp;hl=silencers

Now i'm lucky with my extractor because it leaves through a roof tile, and from groundlevel can't hear the exhaust air coming out. The inlet sucking comes from inside my house though, now that i can hear

My fans aren't boxed in or anything, i'm happy with em just hanging on bungees, but i hear alot of people box/insulate thir fans. Definatly worth a try for stealthy grows.

You will probebly have to insulate ya room in summer m8, Its gunnna get mighty hot in that tin hut! Had to insulate room in concrete garage due to temps out of control in summer.Plus it will reduce noise in room from fans ect...Best of luck