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Will a silencer work in my case?

tbk

Member
Hello.
I'm trying to find a solution to my sound problem. My exhaust duct is gowing through my basement window out in a box. The box is a combined bench and storage(for footbals freebies etc...) with a false bottom,. The box is placed in front of the basement window in my back yard. This is beneath this false bottom that my exhaust is blowing out. In cooler periods of the year i just turn down the fan(build in fan controller) to reduce the noise but this is not possible in the hotter summer period where i need the fan to blow at full speed. My question is then, will a silencer like this help me?
http://growace.com/6-inline-fan-noise-muffler-air-duct-silencer.html
I've been reading a bit upon them but generally it seems to me that people use them to reduce noise in the grow room, where they work by absorbing the sound. My thought is that the sound outside is generated from air hitting the walls of the box and can therefor only be reduced by slowing down the air speed(maybe going from 160mm ducting to 200mm instead) or maybe a bigger outlet room - then i've to build a new bigger bench/storage box.
I don't know if the silencer adds resistance to the airflow thereby reducing the sound in my situation but wouldn't that just be equivalent to turning down the fan?
Can someone please help my decide on what to do? A silencer, bigger ducting, bigger bench/outlet room or...??
 
B

BrnCow

Might try and make a 12x12x18" sealed wood box with an in on one side and an exit on the other ...line with hard insulation... or hell, just buy the silencer... less than $100 delivered...not sure about the store though...
 

ydijadoit

Active member
Like BrnCow said above, you can roll your own silencer, if needed.
I am not an HVAC guy, but I have had good luck lowering the rushing air noise, by going one size larger on my ducting, when needed.
If you are running a 6" fan, I'd get an 8" muffler, and run 8" ducting, from the fan (Using a reducer to connect it), out to the workbench outlet.
Also, make sure your outlet is large enough not to restrict airflow in any way. That would raise the air pressure escaping, and hence, the noise.
HVAC guys, feel free to correct me, just my MacGyver experience with this stuff...
Regards
 

Coconutz

Active member
Veteran
Like BrnCow said above, you can roll your own silencer, if needed.
I am not an HVAC guy, but I have had good luck lowering the rushing air noise, by going one size larger on my ducting, when needed.
If you are running a 6" fan, I'd get an 8" muffler, and run 8" ducting, from the fan (Using a reducer to connect it), out to the workbench outlet.
Also, make sure your outlet is large enough not to restrict airflow in any way. That would raise the air pressure escaping, and hence, the noise.
HVAC guys, feel free to correct me, just my MacGyver experience with this stuff...
Regards

What you're sayin' works, but the biggest difference is when you also get a bigger fan than you need and reduce its speed. Theres less friction or whatever in the ducts and it wont make as much noise.
Ived used silencers and they help a little, but its best to deal with the entire run. I keep my runs straight without any bends and dont need a silencer.
Id like to sell the one I have, but I doubt anyone would want to pay anything for it.
You can also try insulated ducts. They reduce the vibration noise in the room and prevent condensation and shit.
 
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