ᐅ Unfinished ventilation system (mechanical ventilation with heat recovery), noise disturbance when sleeping in the room below?
Created on: 23 Jun 2016 17:30
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Andre8999
Hello everyone,
The installation of the controlled residential ventilation system was planned for our attic. This way, the ducts can be better distributed to the rooms below, and we saved space in the utility room.
Our bedrooms are located on the upper floor (master bedroom, walk-in closet, two children’s rooms, and bathroom). The ceiling to the attic is a wooden beam ceiling with OSB boards, which is insulated but naturally does not provide as much soundproofing as a conventional concrete ceiling on the ground floor. The intended location for the unit is directly above the bedroom. The intake opening is planned to face the gable side. On this side, there is also a children’s room.
Now, I am a bit concerned about noise. I’m wondering if the operation noise of the controlled ventilation system might disturb our sleep at night, or if it is usually quiet enough not to be noticed?
Relocating the system to the other gable side would be possible (there is the bathroom and another children’s room on that side), so we would position the ventilation unit directly above the bathroom, hoping that the noise would then not be heard in the second children’s room.
The disadvantage is that the chimney is also located on this gable side, connected to a wood stove. Could it be possible that, depending on weather conditions and chimney draft, the intake opening of the controlled ventilation system might draw in exhaust gases from the chimney?
Has anyone else installed the controlled residential ventilation system in the attic (within the insulated building envelope)?
The installation of the controlled residential ventilation system was planned for our attic. This way, the ducts can be better distributed to the rooms below, and we saved space in the utility room.
Our bedrooms are located on the upper floor (master bedroom, walk-in closet, two children’s rooms, and bathroom). The ceiling to the attic is a wooden beam ceiling with OSB boards, which is insulated but naturally does not provide as much soundproofing as a conventional concrete ceiling on the ground floor. The intended location for the unit is directly above the bedroom. The intake opening is planned to face the gable side. On this side, there is also a children’s room.
Now, I am a bit concerned about noise. I’m wondering if the operation noise of the controlled ventilation system might disturb our sleep at night, or if it is usually quiet enough not to be noticed?
Relocating the system to the other gable side would be possible (there is the bathroom and another children’s room on that side), so we would position the ventilation unit directly above the bathroom, hoping that the noise would then not be heard in the second children’s room.
The disadvantage is that the chimney is also located on this gable side, connected to a wood stove. Could it be possible that, depending on weather conditions and chimney draft, the intake opening of the controlled ventilation system might draw in exhaust gases from the chimney?
Has anyone else installed the controlled residential ventilation system in the attic (within the insulated building envelope)?
This is interesting. In our case, the mechanical ventilation system with heat recovery is also supposed to go into the attic. In this context, I have two statements in mind that I haven’t been able to verify yet.
First, something I believe came from this forum: a larger-sized system with bigger fans runs at a correspondingly lower speed and is quieter. Then there is the statement from our installer, who recommends the higher-end Broetje unit instead of the standard Vallox device for positioning the mechanical ventilation system above bedrooms, because the Broetje unit is said to produce significantly less noise. I don’t have the exact model names at hand right now – but those are the two options he always installs.
I’m not yet familiar with the details of the topic; so far the only decision made is the installation location = attic.
First, something I believe came from this forum: a larger-sized system with bigger fans runs at a correspondingly lower speed and is quieter. Then there is the statement from our installer, who recommends the higher-end Broetje unit instead of the standard Vallox device for positioning the mechanical ventilation system above bedrooms, because the Broetje unit is said to produce significantly less noise. I don’t have the exact model names at hand right now – but those are the two options he always installs.
I’m not yet familiar with the details of the topic; so far the only decision made is the installation location = attic.
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Sebastian7928 Jun 2016 11:26The idea that a larger system is quieter is also true. However, in our case, we have quite a large volume, so the system still needs to work hard even at nominal ventilation rates...
If there are noise issues from the exhaust duct outside, sound attenuators can be used if necessary. However, if the unit is properly designed: the specified nominal air volume plus 40% should prevent any noise problems. The unit can also be placed on a vibration-isolating rubber mat.
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Bieber08155 Jul 2016 22:41We currently need to regularly clean dust from the outdoor air intake on the facade, which immediately reduces the noise level of the system (audible in the utility room). I hope it will improve once the exterior work and civil engineering are completed. That means if it is excessively loud on your side, dirt could also be causing increased pressure loss and thus reducing the fan performance. It’s worth checking this...
Hello Biber0815,
please check if there is a fly screen behind the cover of the outdoor air intake. This is a common installation error. This screen gets clogged within a few weeks, causing the system to shut down because it no longer receives outside air. Please also check the exhaust air. Otherwise, there will be high power consumption, motor wear, and increased noise from the unit!
please check if there is a fly screen behind the cover of the outdoor air intake. This is a common installation error. This screen gets clogged within a few weeks, causing the system to shut down because it no longer receives outside air. Please also check the exhaust air. Otherwise, there will be high power consumption, motor wear, and increased noise from the unit!
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Bieber08156 Jul 2016 22:17HIGIL schrieb:
please check if there is a fly screen behind the cover of the external air intake. This is a common installation mistake. I don’t understand—would it be a mistake if the screen is missing, or is having a screen installed an error? In our case, there is a fly screen in the external air supply/ventilation that we currently clean regularly.
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