ᐅ Fan Speed of Your Helios Controlled Residential Ventilation System

Hello everyone,

A question about your Helios controlled ventilation system:

At what speed does your Helios controlled ventilation run, and what is your target airflow rate?

Our target value is 190 m³/h (112 CFM), and the system adjusts to 1950 rpm (supply air, draft) and 1680 rpm (exhaust air).

In two supply rooms, this creates a sound pressure level of 38 dB(A), which we find too loud.

Best regards

jx7

Which exact device? Do you have silencers (noise suppressors)?

Controlled residential ventilation EC 370 with a 1000 mm (39 inches) silencer installed directly between the controlled residential ventilation unit and the distribution box.

Our rotational speeds are similar, but I haven’t measured the noise level. Ours is audible when it’s quiet, but currently that is due to a fan with a faulty ball bearing.

During the initial on-site meeting with representatives from the manufacturer Helios, everyone agreed that the system in the basement is unusually loud, louder than Helios systems typically 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 emits 56 dB_A, and with the new reduced setting, it is still 53 dB_A. The manufacturer’s specification for 200 m³/h (118 CFM) is 41 dB_A, which is 12 dB_A lower than the value measured 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 in the reduced setting is 4 times as loud as indicated in the catalog.

However, it is now being said that this is normal, and the 41 dB_A value is just a laboratory figure, with higher values expected in practice.

I understand that lab values and real-world values can differ, but in my opinion, being 4 times as loud should not be acceptable; to me, it sounds like VW emissions figures.