ᐅ Experience with Noise Levels in dB(A) of a Central Mechanical Ventilation System with Heat Recovery
Created on: 15 Aug 2017 20:49
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How 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?
With a series of measures (omission of a pollen filter in the bypass, extension of the silencer from 42 cm (17 inches) to 100 cm (39 inches), additional silencer for the duct leading to the loudest room, sound-insulating volume elements (SVE) in two rooms, and reducing the system’s power), the noise situation was significantly improved so that the system is still clearly audible but no longer extremely loud.
However, I still suspect that all these measures were only necessary because the noise level produced by the system in the basement is already 12 dB_A (= 4 times louder) above the manufacturer’s specifications, which surprises me somewhat and was also acknowledged during the initial onsite visit that the system is clearly louder than other systems.
However, I still suspect that all these measures were only necessary because the noise level produced by the system in the basement is already 12 dB_A (= 4 times louder) above the manufacturer’s specifications, which surprises me somewhat and was also acknowledged during the initial onsite visit that the system is clearly louder than other systems.
Yes, the extension of the sound insulator to 100 cm (39 inches) was the retroactive completion of the intended condition.
The general contractor did not charge us for any of the mentioned measures. He had also assured us of compliance with DIN 4109 in the construction contract, which means a maximum of 35 dB_A in the rooms.
The general contractor did not charge us for any of the mentioned measures. He had also assured us of compliance with DIN 4109 in the construction contract, which means a maximum of 35 dB_A in the rooms.