Return Fan ...

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Mossy Beard
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Post Tue. Aug. 12, 2008 6:45 am

I completed my "return fan" install to help get more positive air circulation.
I used a Field 6" inline fan, connected to a 4 x 12" floor register. It is in a spare bedroom at one of the fartherest points from my stove.

Initial observations -
It moves a considerable amount of air but.....
The noise is very,very loud !

The majority of the install is "hard" duct to the basement floor. The fan is about 20" below the floor register.

Any ideas on how to quiet it down ?

I'll most likely have to shut it down while sleeping ??

Thanks, Mossy Beard

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Richard S.
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Post Tue. Aug. 12, 2008 6:52 am

Can't you run a duct to the register and place the fan somewhere further away?

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LsFarm
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Post Tue. Aug. 12, 2008 6:59 am

As Richard said, put the fan as far away from the bedroom floor register as possible.. I'd put it in the basement, near the end of the duct, just before the heat source..

I don't recommend duct fans, I prefer to use the fans on already on the stove or furnace.. They are squirrel cage fans, they move a lot of air, and make very little noise..

You may be able to add a speed controler/reostat to the duct fan, and slow it down just a little, often this is enough to make a big difference in the noise it makes. But I'd move it first, before buying more parts/pieces.

Greg L


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Devil505
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Post Tue. Aug. 12, 2008 8:01 am

Mossy Beard wrote:Any ideas on how to quiet it down ?
I had the same problem with a 6" duct booster fan I bought at Home Depot & the fan company replaced the fan for me with a quieter one. It was a Suncourt inline duct fan model DB206. ( I guess they had a design problem with it....made a racket!)
The new one is fine & is even 2 speed!

In any case, I would contact the fan company & see if they will replace it.

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Adamiscold
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Post Tue. Aug. 12, 2008 9:13 am

LsFarm wrote:A
They are squirrel cage fans, they move a lot of air, and make very little noise..

Greg L
Is there a way to connect a squirrel cage fan to a heating duct? How would it draw heated air from a stove through the duct to the vent? Is it even possible?

Mossy Beard
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Post Tue. Aug. 12, 2008 1:05 pm

I followed the mfg. instructions to "mount the fan as close as possible to the problem area" :? I also listened to the Vendors same suggestion.
Looking back that may be the best for performance but does little for your ears ?
I guess I'll be moving the fan :(
I used hard duct for the insatllation ; I don't know if "flex" would have been better ? ( noise)

Mossy Beard


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Adamiscold
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Post Wed. Aug. 13, 2008 9:40 am

I used hard duct for the installation ; I don't know if "flex" would have been better ? ( noise)
I think hard duct is going to give you a better air flow with less restrictions then a flex duct would. You can always try insulating the duct work to not only help with the sound but to help keep what temperature the air is at in the duct consistent throughout the length of the duct.

Mossy Beard
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Post Thu. Aug. 14, 2008 6:44 am

I moved the fan farther away from the floor register.
I have to pick up some flex this weekend. Then I'm going to make a flex transition boot to connect to the register. I'll keep the fan some distance away in the hard pipe and see what happens.

Mossy Beard

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Post Thu. Aug. 14, 2008 7:31 am

Yes, In line fans are very noisey and tranfers the sound throughout the pipe. Flex would help in the noise, but also reduce the velocity.

I think they make the rubber adapter transistion pieces, you can put one on each end of the fan housing to connect the pipe, that will not transfer the noise generated by the fan to the pipes. Something like attached.
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Adamiscold
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Post Thu. Aug. 14, 2008 10:21 am

Great idea Dave, the rubber would be sure to absorb the noise and vibrations from the fan without sacrificing the amount of air being moved through the rigid duct work.

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