ᐅ Neighbor’s ventilation system set too high and therefore too noisy?
Created on: 19 Jul 2021 16:43
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Toja007Hello dear forum members,
I am reaching out to you with a problem:
Our neighbors have a controlled central ventilation system (probably a Stiebel Eltron 280), which we find "too loud" and, in my opinion, incorrectly adjusted.
It produces about 60 dB(A) sound pressure level at the exhaust outlet, which faces our terrace. On our terrace, about 8m (26 feet) away, it sounds like a constant airplane flying overhead. The air velocity in the 160mm (6.3 inch) duct is 2.6–2.8 m/s (meters per second), which I calculate to be about 200 m³/h (cubic meters per hour) of air volume (see side question below regarding supply air vs. exhaust air).
This occurs between 7:30 a.m. and 9 p.m., although hardly anyone is home on weekdays during this time (also on weekends, even with open windows). In the evenings, they reduce the system. This is all happening now in summer (May to September); in autumn/winter, they generally turn the system down!?
Our neighbors refer us to the plumbing company that installed and maintains the system; according to them, the system is correctly set.
House data: approx. 450 m³ (cubic meters),
5 occupants
==> Therefore, I come to a required air exchange rate of about 130–150 m³ per hour (factor 0.3 or 25–30 m³ per person for “normal air”).
Side question: On the weekend, they were airing out for two whole days during the daytime at the highest supply air setting, with an air velocity of 3.6 m/s (meters per second) = 260 m³/h, but on the exhaust side, it was 4.5 m/s = 325 m³/h, with a sound pressure level of 70 dB(A). That is 25% higher. It seems to me that the exhaust air from the rooms is set too high? I once read about a maximum deviation of +5–10%.
What do the experts in this forum think? I have already tried talking to the neighbor and might have an independent plumbing company inspect it. So far, no success...
Kind regards, Toja
I am reaching out to you with a problem:
Our neighbors have a controlled central ventilation system (probably a Stiebel Eltron 280), which we find "too loud" and, in my opinion, incorrectly adjusted.
It produces about 60 dB(A) sound pressure level at the exhaust outlet, which faces our terrace. On our terrace, about 8m (26 feet) away, it sounds like a constant airplane flying overhead. The air velocity in the 160mm (6.3 inch) duct is 2.6–2.8 m/s (meters per second), which I calculate to be about 200 m³/h (cubic meters per hour) of air volume (see side question below regarding supply air vs. exhaust air).
This occurs between 7:30 a.m. and 9 p.m., although hardly anyone is home on weekdays during this time (also on weekends, even with open windows). In the evenings, they reduce the system. This is all happening now in summer (May to September); in autumn/winter, they generally turn the system down!?
Our neighbors refer us to the plumbing company that installed and maintains the system; according to them, the system is correctly set.
House data: approx. 450 m³ (cubic meters),
5 occupants
==> Therefore, I come to a required air exchange rate of about 130–150 m³ per hour (factor 0.3 or 25–30 m³ per person for “normal air”).
Side question: On the weekend, they were airing out for two whole days during the daytime at the highest supply air setting, with an air velocity of 3.6 m/s (meters per second) = 260 m³/h, but on the exhaust side, it was 4.5 m/s = 325 m³/h, with a sound pressure level of 70 dB(A). That is 25% higher. It seems to me that the exhaust air from the rooms is set too high? I once read about a maximum deviation of +5–10%.
What do the experts in this forum think? I have already tried talking to the neighbor and might have an independent plumbing company inspect it. So far, no success...
Kind regards, Toja
As the operator of the system, I have no reason to adjust anything or to suspect that anything is set incorrectly.
200 cubic meters per hour for the house size is completely fine for standard ventilation. You don’t always have to run just the minimum ventilation rate.
Emissions can be reduced using silencers and other hoods. A hedge can also help.
200 cubic meters per hour for the house size is completely fine for standard ventilation. You don’t always have to run just the minimum ventilation rate.
Emissions can be reduced using silencers and other hoods. A hedge can also help.
Hello face26,
yes, I got an anemometer. The sound pressure was measured amateurishly with a smartphone.
However, there is also a guideline stating that a maximum of 50 dB(A) is allowed in residential areas. So turning it down a bit could help if necessary, because every 3 dB(A) reduction halves the noise level.
yes, I got an anemometer. The sound pressure was measured amateurishly with a smartphone.
However, there is also a guideline stating that a maximum of 50 dB(A) is allowed in residential areas. So turning it down a bit could help if necessary, because every 3 dB(A) reduction halves the noise level.
Toja007 schrieb:
The silencer should be installed in the exhaust duct?Yes, exactly there.Toja007 schrieb:
How does it work technically?Just like in an automobile.Similar topics