ᐅ Mechanical Ventilation with Heat Recovery – You Can Hear Every Word from Another Room – Is This Normal?
Created on: 30 Jul 2018 22:43
D
Dodo86
Hello everyone,
We had the final inspection of our house two weeks ago. Now we have noticed that through the central ventilation system in the guest bathroom and utility room, every word spoken in the dining/kitchen/living area can be heard very clearly, as if you were sitting right next to each other. With the bathroom door open, the sound naturally carries up to the children’s bedrooms upstairs. On the upper floor, the sound transmission through the controlled mechanical ventilation system is significantly less.
Can I still report this as a defect after the final inspection?
Thank you very much and best regards!
We had the final inspection of our house two weeks ago. Now we have noticed that through the central ventilation system in the guest bathroom and utility room, every word spoken in the dining/kitchen/living area can be heard very clearly, as if you were sitting right next to each other. With the bathroom door open, the sound naturally carries up to the children’s bedrooms upstairs. On the upper floor, the sound transmission through the controlled mechanical ventilation system is significantly less.
Can I still report this as a defect after the final inspection?
Thank you very much and best regards!
Well, once again you have an example of poor planning. But based on the pictures, the construction quality looks quite good.
The system is undersized for the house, although it still meets the minimum requirements according to DIN standards. It seems that only the minimum number of silencers were installed in the system—just enough to pass, without any margin.
Of course, the airflow volumes should be correct according to the calculations, but in practice, noise occurs everywhere, and the air inside the house still feels stale. This matches exactly what you described.
The system is undersized for the house, although it still meets the minimum requirements according to DIN standards. It seems that only the minimum number of silencers were installed in the system—just enough to pass, without any margin.
Of course, the airflow volumes should be correct according to the calculations, but in practice, noise occurs everywhere, and the air inside the house still feels stale. This matches exactly what you described.
Mycraft schrieb:
Of course, the airflow volumes will match the calculations, but in practice, you end up with noise everywhere and the indoor air still feels stale. Exactly what you are describing.Is there a general rule of thumb—something like having the maximum capacity 40 or 50% above the demand—so that a system operates "within the optimal speed range" rather than "running flat out"? (I’m mainly thinking in terms of efficiency—because what’s the point of having only half-fresh air).https://www.instagram.com/11antgmxde/
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You can check the datasheets to see the expected sound pressure level and power consumption at different load levels. I would say 60-70% load as a general guideline; under normal ventilation, the system should not operate above this range.
165 sqm (1779 sq ft) ventilated area including the overflow zone * 2.5 m (8.2 ft) ceiling height * 0.5 air exchange rate per hour = 206 m³/h (121 CFM)
At this rate, the original poster's system is already running at over 90% capacity. Intensive ventilation is therefore no longer possible.
165 sqm (1779 sq ft) ventilated area including the overflow zone * 2.5 m (8.2 ft) ceiling height * 0.5 air exchange rate per hour = 206 m³/h (121 CFM)
At this rate, the original poster's system is already running at over 90% capacity. Intensive ventilation is therefore no longer possible.
I wanted to give a quick update.
Someone from the company came by and inserted foam plugs about 10cm (4 inches) thick into all the supply and exhaust air vents. He said these are sound dampers. And it really is much better now. I still need to test the impact on conversations with my husband tonight. But the loud noise from the system is now hardly transmitted at all.
Do you think these plugs could negatively affect ventilation? According to Alex85’s calculation, the system is already operating at full capacity.
Someone from the company came by and inserted foam plugs about 10cm (4 inches) thick into all the supply and exhaust air vents. He said these are sound dampers. And it really is much better now. I still need to test the impact on conversations with my husband tonight. But the loud noise from the system is now hardly transmitted at all.
Do you think these plugs could negatively affect ventilation? According to Alex85’s calculation, the system is already operating at full capacity.
Yes, exactly those devices are installed now. The system is set to 40% capacity in "normal operation." I assume that this is actually not enough, which is why the air seems to be used up or is. But when it runs at 100%, it still makes a loud noise in all the rooms. The installer said you never really need 100%, only if you have a party or something like that…