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Insulated Duct Noise Reduction???
- Thread starter mpd
- Start date
i would not say that between insulated/non insulated ducting there is a night and day difference... however, it does help quite a bit.
the trick to killing the noise is to start at the source of the noise and work your way out. for example like you said building a box for it.
mounting them on rubber bushings, or hanging them with rubber bungies helps.
they also make mufflers, fan speed controllers, etc.
just any little thing you do adds up.
youll never kill the noise completely though.
the trick to killing the noise is to start at the source of the noise and work your way out. for example like you said building a box for it.
mounting them on rubber bushings, or hanging them with rubber bungies helps.
they also make mufflers, fan speed controllers, etc.
just any little thing you do adds up.
youll never kill the noise completely though.
whoops. double post
T
TribalSeeds
Get a bigger fan and reduce the speed.
Make your lines straight without sagging.
Insulate the duct
Make your lines straight without sagging.
Insulate the duct
I was researching last night on here and I dug up a thread where a guy ran 8 inch insulated ducting inside 10 inch. I am going to try that route probably. I also got a whisperline fan, I hope that helps... I'm in the same boat man. Double insulated ducting like that seems like a good choice but I never tried, we'll see soon!
G
gloryoskie
I did one like this, very good silencer, can't find the original post:
Got it all hooked up. Definitely attenuates the sound by about 50% or more. The rushing air noise of the exhaust is completely eliminated. I applied some stick-on insulation to the external length of duct, which further reduced noise. 100% worth the trouble of building.
There's still some noise coming from the fan and duct, but it's much less than what it was. Before, it was barely tolerable, almost as loud as an air conditioner. Now, it's a fairly gentle noise, which is completely canceled out if another device is running (TV, fan, etc). I'm still going to run the main ventilation fan 12/12 with the light, as realistically at night when everything's quiet I can still hear it pretty well, and don't like that kind of racket when I'm trying to sleep.
FYI, my muffler is 4" internal, 6" OD, and 36" long. Filled with poly, as it exhausts into the house.
You will need to buy:
1x 6" hard duct
1x 4" to 6" reducer
2x 4" starter collar
4' by 4' (or 4' by 6') Machine Cloth (Mesh)
Polyfill batting (like in pillows or stuffed animals) and Sub woofer boxes.
Steel Tape
Got it all hooked up. Definitely attenuates the sound by about 50% or more. The rushing air noise of the exhaust is completely eliminated. I applied some stick-on insulation to the external length of duct, which further reduced noise. 100% worth the trouble of building.
There's still some noise coming from the fan and duct, but it's much less than what it was. Before, it was barely tolerable, almost as loud as an air conditioner. Now, it's a fairly gentle noise, which is completely canceled out if another device is running (TV, fan, etc). I'm still going to run the main ventilation fan 12/12 with the light, as realistically at night when everything's quiet I can still hear it pretty well, and don't like that kind of racket when I'm trying to sleep.
FYI, my muffler is 4" internal, 6" OD, and 36" long. Filled with poly, as it exhausts into the house.
You will need to buy:
1x 6" hard duct
1x 4" to 6" reducer
2x 4" starter collar
4' by 4' (or 4' by 6') Machine Cloth (Mesh)
Polyfill batting (like in pillows or stuffed animals) and Sub woofer boxes.
Steel Tape
Pull the inside of your insulated duct back exposing the insulation for a few feet. Works the same as a silencer. 1
qupee
Member
Pull the inside of your insulated duct back exposing the insulation for a few feet. Works the same as a silencer. 1
You do NOT want to do this if the insulation is made of fiberglass (and most insulated flex duct is).
medicine farmer
Member
also try replacing ducting with pvc pipe where ever possible...the smooth interior results in less air turbulence (which is a big source of noise) as compared to the ducting with the "rings" on the interior and sags and bends through out
Be careful if using in conjunction with lights. Take a bit of that poly and put a flame to it......
This method (post #8) is for exhaust, it cuts down the exterior noise quite a bit. do what works for you and your situation. 1
It is worth noting that insulated ducting, and acoustic ducting are not the same thing, one is made to provide thermal insulation, and the other is made to reduce noise. Thermally insulated ducting will reduce noise somewhat, but not as much as the proper acoustic ducting.
Thermally insulated ducting is normal ducting, with a layer of insulation, and an outer sleeve. Acoustically insulated ducting is normal ducting with perforations in it, a clear vapour barrier, insulation and the outer sleeve.
Sono-dec is a popular brand of acoustic ducting in Europe.
Thermally insulated ducting is normal ducting, with a layer of insulation, and an outer sleeve. Acoustically insulated ducting is normal ducting with perforations in it, a clear vapour barrier, insulation and the outer sleeve.
Sono-dec is a popular brand of acoustic ducting in Europe.
4" acoustic ducting is really noisy! I recommend using 6" ducting with 6"-4" reducer for connecting fan & filter.
Or 5" solid plastic or steel rigid ducting (again with 6"-4" reducers for fan & filter
If you go for rigid ducting it can get expensive especially if you by from a grow shop, specalist suppliers on the local or Internet are the way to go.
Oh yeah if you can turn down your fan then noise from airflow will drop but you may get humming from the fan...
Lot of pieces to this puzzle.
Or 5" solid plastic or steel rigid ducting (again with 6"-4" reducers for fan & filter
If you go for rigid ducting it can get expensive especially if you by from a grow shop, specalist suppliers on the local or Internet are the way to go.
Oh yeah if you can turn down your fan then noise from airflow will drop but you may get humming from the fan...
Lot of pieces to this puzzle.
gardenfather
Active member
I have a Question would this be something good to use to help stop the noise a bit.
ducting hose insulated - http://www.homedepot.com/p/Master-F...le-Duct-R6-Silver-Jacket-F6IFD4X300/100396934
Or
http://www.amazon.com/12-Flex-Insulated-Duct-Hose/dp/B000AELGUE
Thanks
ducting hose insulated - http://www.homedepot.com/p/Master-F...le-Duct-R6-Silver-Jacket-F6IFD4X300/100396934
Or
http://www.amazon.com/12-Flex-Insulated-Duct-Hose/dp/B000AELGUE
Thanks
Insulated ducting does cut down on the noise of air wooshing around in the ducting,use oversized insulated ducting to cut down on that noise even more as well as moving the air more efficiently with less pressure losses.Also build an insulated fan box to cut down on noise from the fan motor and use a duct muffler at the end of your duct run to cut down on noise of the air dumping out of the ducting.
