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Old 01-27-2016, 04:40 AM   #1
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Noisy central ventilation system


Hi,

We have moved into an old apartment from 1885. A central ventilation system was installed in the bathroom and the kitchen in all the apartments before we moved in.

The whole system is connected to an engine on the roof (metal pipe with a mushroom shaped engine on the top).

1) The level of the system can be set from 1 to 10. It is currently set to 5.

If I turn the level of the system all the way down to 1, the noise level in the bathroom and the kitchen is still 50-52 decibel (when the measurement tool is held next to the ventilation hole in the bathroom/the turned off exhaust in the kitchen).

If I turn the system off, the noise level goes down to wonderful 35 decibel in both the bathroom and the kitchen.

Any idea what could be wrong when the system create so much noise even if turned all the way down to 1?

2) The engine on the roof is placed 3-4 meters from out balcony

When the engine is running, the noise level on the balcony is 52-54 decibel. If I turn of the engine, the noise level goes down to around 46 decibel (we live in the middle of the city).

Can something be done to the engine so we can start using our balcony?

3) If I turn off the engine on the roof, the noise level in the bathroom and kitchen is still the same as if the engine is turned on (50-52 decibel).

It is only if I turn of the system that the noise level goes down to 35 decibel in the bathroom and the kitchen.

Any idea why the noise level doesn't go down when I turn of the engine?

Thanks a lot for your help.

// Mads
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Old 01-27-2016, 07:45 AM   #2
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what is the noise level of other apartments? are they all noisy?..it could be the fan is out of balance, or its a cheaper unit that doesnt have any noise insulation around the motor...
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Old 01-27-2016, 08:29 AM   #3
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The neighbours bathroom is just as noisy (their kitchen doesn't have an exhaust).
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Old 01-27-2016, 09:28 AM   #4
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it could be just noisy fan units, try calling the management company and complain to them about the noise..it would be there responsibility to fix them..
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Old 01-27-2016, 01:12 PM   #5
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Thanks, but here is no one to complain to. The apartment is an owned apartment in Denmark - and there is no maintenance person etc.
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Old 01-27-2016, 01:42 PM   #6
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ahh..ok that doesnt help, can you get on the roof where all these fan units are? if so take a listen to all of them and see if they all make the same noise, if so, then you might be able to build a sound wall on one side of the fan, so you dont block the venting of the unit, like they build the sound walls on highways to block traffic noise...away from your balcony direction..
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Old 01-27-2016, 01:46 PM   #7
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A sound wall sounds like an excellent idea!

There is only one fan unit, but the people above us say they can see another fan unit that is less noisy than ours. So I guess there might be something wrong with our fan.
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Old 01-27-2016, 02:28 PM   #8
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It may be out of balance.
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Old 01-27-2016, 02:33 PM   #9
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as said in post #2, check for problems first to determine the louder noise is normal for that fan...better to fix the problem before it gets worse and you have to replace the fan unit..
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