ᐅ Experience with Noise Levels in dB(A) of a Central Mechanical Ventilation System with Heat Recovery
Created on: 15 Aug 2017 20:49
J
jx7How loud is your centralized mechanical ventilation system with heat recovery, measured in dB_A?
Specifically, the sound level in the living areas at a distance of one meter (about 3 feet) from the air outlets, measured at the normal daytime operating setting, based on the commissioning data of the system.
(There are smartphone apps that can measure this, but be sure they actually measure or display dB_A and not just dB.)
How loud is the system itself, measured in the technical room at a distance of one meter (about 3 feet) from the ventilation unit?
Which model do you have?
Specifically, the sound level in the living areas at a distance of one meter (about 3 feet) from the air outlets, measured at the normal daytime operating setting, based on the commissioning data of the system.
(There are smartphone apps that can measure this, but be sure they actually measure or display dB_A and not just dB.)
How loud is the system itself, measured in the technical room at a distance of one meter (about 3 feet) from the ventilation unit?
Which model do you have?
M
meister keks15 Aug 2017 22:38I can’t tell you that, but I don’t find the noises disturbing. It also depends on which setting you choose.
During the first on-site meeting with representatives from the manufacturer Helios, everyone agreed that the system in the basement is unusually loud, louder than Helios systems usually are. This was confirmed by a measurement using a professional sound pressure level meter.
In the original setting (voltage for 190 m³/h (112 cfm) according to the curve from the diagram), the system produces 56 dB_A, and in the new reduced setting, it still produces 53 dB_A. The manufacturer’s specification at 200 m³/h (118 cfm) is 41 dB_A, which is 12 dB_A lower than the value in the reduced setting. Since an increase of 6 dB_A is perceived by humans as a doubling of loudness, it can be said that the system at the reduced setting is 4 times as loud as stated in the catalog.
It is now being said that this is all normal and that 41 dB_A is just a laboratory value, with higher values possible in practice.
I understand that laboratory values and real-life values can differ, but in my opinion, being 4 times louder is unacceptable; to me, this sounds like the VW emissions scandal.
We would definitely not recommend the Helios controlled residential ventilation system; the ventilation is clearly audible at normal settings in the rooms, and we find the noise unpleasant.
In the original setting (voltage for 190 m³/h (112 cfm) according to the curve from the diagram), the system produces 56 dB_A, and in the new reduced setting, it still produces 53 dB_A. The manufacturer’s specification at 200 m³/h (118 cfm) is 41 dB_A, which is 12 dB_A lower than the value in the reduced setting. Since an increase of 6 dB_A is perceived by humans as a doubling of loudness, it can be said that the system at the reduced setting is 4 times as loud as stated in the catalog.
It is now being said that this is all normal and that 41 dB_A is just a laboratory value, with higher values possible in practice.
I understand that laboratory values and real-life values can differ, but in my opinion, being 4 times louder is unacceptable; to me, this sounds like the VW emissions scandal.
We would definitely not recommend the Helios controlled residential ventilation system; the ventilation is clearly audible at normal settings in the rooms, and we find the noise unpleasant.
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