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Sound insulation Sasha 07-03-2006
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Posted by Sasha on July 3, 2006, 11:05 am
I have range hood over gas range. There is wall mounted exterior blower
and 8" diameter flex aluminum duct that connects from the blower to the
hood. The hood and duct are concealed inside custom built wooden
cabinet. The duct is really short, in fact it is no more then 90
degrees elbow. The blower is rather powerful and even if it operates at
lowest speed it still causes quite noise in kitchen. I thought about
putting some sort of inculation into cabinet that conceals the duct
with hope to reduce noise from the blower. What kind of insulation
provides maximum sound insulation? Are there any other steps that can
reasonable be done to reduce blower noise?


Posted by Joseph Meehan on July 3, 2006, 2:31 pm
Sasha wrote:
> I have range hood over gas range. There is wall mounted exterior
> blower and 8" diameter flex aluminum duct that connects from the
> blower to the hood. The hood and duct are concealed inside custom
> built wooden cabinet. The duct is really short, in fact it is no more
> then 90 degrees elbow. The blower is rather powerful and even if it
> operates at lowest speed it still causes quite noise in kitchen. I
> thought about putting some sort of inculation into cabinet that
> conceals the duct with hope to reduce noise from the blower. What
> kind of insulation provides maximum sound insulation? Are there any
> other steps that can reasonable be done to reduce blower noise?

I suspect most of the noise is coming from the blower and since it
appears it is very close to the living area and has only a short air path, I
don't think there is much you can do other than to opt for a quieter blower.

--
Joseph Meehan

Dia duit



Posted by Glenn on July 3, 2006, 3:00 pm
Is it new or maybe old and has dirt (gunk) built up on the
squirrel cage fan? Cleaning may help. Any small off balance of
the fan will set up a vibration noise that maybe remounting the
blower on cushions might help. It will resonate through the
cabinat. I have a patio fountain pump that was noisy sitting on
the plastic bottom that I put a piece of sponge under it and it
quieted right down.

If it is wind noise, there is nothing you can do, that I have
found. I have installed a few like that, seems like they were
Thermador brand and they are just wind noisy but efficient and
expensive.

>I have range hood over gas range. There is wall mounted
> exterior blower and 8" diameter flex aluminum duct that
> connects from the blower to the hood. The hood and duct
> are concealed inside custom built wooden cabinet. The
> duct is really short, in fact it is no more then 90
> degrees elbow. The blower is rather powerful and even if
> it operates at lowest speed it still causes quite noise
> in kitchen. I thought about putting some sort of
> inculation into cabinet that conceals the duct with hope
> to reduce noise from the blower. What kind of insulation
> provides maximum sound insulation? Are there any other
> steps that can reasonable be done to reduce blower noise?


Posted by djenkins6 on July 4, 2006, 3:24 am
how about extending the duct, put in a right angle bend and move the
blower down the wall, building some sort of exterior cabinet covered
with siding etc to match the house.

David


Posted by Sasha on July 4, 2006, 9:32 am
The blower is Broan brand, brand new and is mounted to siding outside
if the house. There is no way to move it anywhere. The noise is a wind
noise, no vibrations from duct, cabinet, etc. While I probably won't
completely reduce noise, I can reduce it if I stuff good sound
insulation into the cabinet that conceals the duct. The cabinet is not
competely finished yet but even if I wrap it into duct foil unsulation
I find there is les noise in the kitchen.


djenkins6 wrote:
> how about extending the duct, put in a right angle bend and move the
> blower down the wall, building some sort of exterior cabinet covered
> with siding etc to match the house.
>
> David


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