DIY Fan Box (Low Noise/Low Budget)

[Baino]

Hi..

here is my way of making a low noise fan box on a low budget.



This lillte guide will mainly pictures.

For the fan box i have used:


- Ventilator, RVK160 air=700cm3.
- Govenor Regulator.
- Wood (ive used leftovers from my closet, 16mm)
- Absorbing mat (i found this in the local hardware store,)
- Rockwool (ive used normal cheap rockwool)
- Wirer (for den controller)
- Silver Tape (gaffa)


i did my calculations by eye meassure, but if a more perfect result is wanted i suggest you do calculation properly.


well.. as you can see on the picture i builded a very normal and regular box, coated the innerside with rockwool and some absorbing mat adjustet to macth all around keeping in mind having space for the lid.


(here we have open the lid of the box)


(this "mat" is mate of roockwool and coated on top with some absorbing mat and finally fasten with the silver tape.)


Here we see the lid coated with some absorbing mat so i fitts with the edges of the box.




Ive used this lillte door lock to hold the lid in place when closed.







Result:

Im comparing with my S&P TD350 Silent and the Fan Box is more quiet set on minimum rpm.

im using normal ducting at the momment but will change to the coated ducting in a near future and this will properly reduce the rest of the noise level quit a bit so it will be even more low noise.



Hope this will help some of the people out there looking for a cheap and effective fan box solution.

ciao

 

[OldSSSCGuy]

Very cool... thanks for that.

 

[Iffy-Caradoc]

Yeah I wrap my fan in a thick wodge of insulation to quiet it down. I got a question - have you ever experienced a fan overheating in such an enclosed/wrapped space?

 

[growingcrazy]

You shouldn't have any over heating issues since air is passing over the motor all the time. Unless your evacuating 150+ degree air

 

[Harry Gypsna]

Nice work. I've seen a few people wrap the fan in a bin bag, attach ducting and then place it in the box and spray in expanding foam as the insulator.

 

[Vernal Equinox]

Nice work. I've seen a few people wrap the fan in a bin bag, attach ducting and then place it in the box and spray in expanding foam as the insulator.

This is what I did, but I wonder if the hardened foam is as silent as soft foam would be? I do still get some vibrations.


Nice thread, OP...thanks.

 

[Baino]

thanks guys..

yes you can also do the trick with the foam.. also a lillte tip for those who wont build a fan box, take a sleeping bag and rappet around the venti.. this will also take alot of noise.

 

[Baino]

Yeah I wrap my fan in a thick wodge of insulation to quiet it down. I got a question - have you ever experienced a fan overheating in such an enclosed/wrapped space?

no.. and its the first run with this fan box(about 2 months now), but keep in mind, that as long as you dont push the fan to much(with to many bendings and so on), the heat buildup will be minimal. i havent got any problems what so ever with heat building up in the box.

 

[Iffy-Caradoc]

Fans

Fans

no.. and its the first run with this fan box(about 2 months now), but keep in mind, that as long as you dont push the fan to much(with to many bendings and so on), the heat buildup will be minimal. i havent got any problems what so ever with heat building up in the box.

Yeah thanks Baino, mine's a straight 6" to the fan so happy days.
For those concerned with vibration/harmonising noise. I never attatch the fan body to the vent pipe & I never mount the fans on a wall. I always suspend them from strong rubber/elastic & use acoustic flexi ducting both sides. I find shelf brackets are good for hanging fans - the cheap ones. Just fix it to the wall as usual & attatch your elastic to the screw hole at the point.
I'll post a photo if anyone wants to see it.
Stay safe

 

[Baino]

 

[SeaMaiden]

Yeah thanks Baino, mine's a straight 6" to the fan so happy days.
For those concerned with vibration/harmonising noise. I never attatch the fan body to the vent pipe & I never mount the fans on a wall. I always suspend them from strong rubber/elastic & use acoustic flexi ducting both sides. I find shelf brackets are good for hanging fans - the cheap ones. Just fix it to the wall as usual & attatch your elastic to the screw hole at the point.
I'll post a photo if anyone wants to see it.
Stay safe

Please do, please.

 

[zingablack]

Id use Roxul safe n sound insulation to insulate that box. 39.99 for 60sq ft of it. Mold and fire resistant, also it's mineral wool not fiberglass. Amazing acoustic deadening properties. I'd use this over expanding foam añyday. Ever see that foam stuff on fire? It's NASTY!

Go to Roxuls website and watch them do fire tests. Is awesome.

My noise went from airport levels of air movement. To my realization that air pumps actually hummed and that I needed to do something about that now. Lol

 

[qupee]

Id use Roxul safe n sound insulation to insulate that box. 39.99 for 60sq ft of it. Mold and fire resistant, also it's mineral wool not fiberglass. Amazing acoustic deadening properties. I'd use this over expanding foam añyday. Ever see that foam stuff on fire? It's NASTY!

Go to Roxuls website and watch them do fire tests. Is awesome.

My noise went from airport levels of air movement. To my realization that air pumps actually hummed and that I needed to do something about that now. Lol

This, Roxul!

Those fire videos are amazing. Look for budderfly's building a 4x6 room thread, he insulated the whole room with it and said it really aborbs the noise well. Here's the thread at the Roxul post: https://www.icmag.com/ic/showthread.php?p=5333403#post5333403

Otherwise I'd use acoustic foam, but I don't even know if they make any that won't produce loads of toxic smoke.

Either would work much better than fiberglass

 

[Iffy-Caradoc]

Elasticated fan suspension.

Elasticated fan suspension.

Please do, please.

Here's two photos - you get the idea.
Stay safe

 

[SeaMaiden]

I can't see your pix.