Quiet decentralized ventilation for new single-family house

Which company is the system from? What is it called?

The calculation refers to a system with inventer. However, the new system is not from InVENTer. It comes from the company EKML and is called Pendellüftung. EKML wanted to market it together with inVENTer. But they refused. The heart of the system is the controller. In combination with the right motors, it works great. I recently equipped an old vaulted cellar that was soaking wet with it. 2 fans at full load 120 m³/h. That means about 4 g of water per m³/h. The cellar will never be a living room, but for the first time you can see that the cellar is getting drier.

Hello BeHaEIJa,

Der Bautenschutz ist wohl auch auf Stufe 1 gewährleistet.

How many square meters do the fans cover per hour at the lowest level? A general statement like "At level 1, the construction site protection is probably ensured as well." would not personally satisfy me. I would first have it calculated whether it is sufficient and, above all, sensibly plan where a fan should/must be placed.

Just took a look...

According to the manufacturer, Sevi160 should cover about 16 sqm/h on level 1 (between 0.2 & 0.25 W per sqm) and be about 16.5 dB loud (for comparison: normal breathing is noticeably louder). If that’s true, these are very quiet. Hardly any other values are available from Inventer.

However, I just calculated the power consumption for a year and no longer find it so efficient. For a pair of fans, you would have to expect around €16 in electricity costs per year (and that at level 1).

A ventilation concept was created by a sales partner of Sevi - it turned out that 8 single units, as well as one double unit, are necessary. Bathrooms are supplied separately by humidity-controlled exhaust fans. Actually, there is a reverse fan as a single unit in every room, in the "fitness room" there is a double fan, and in the utility room upstairs there is an air distributor that only blows in the hallway without exchanging air. I asked if that also serves a sleeping couple, since I consider 8 m³/h too low (I had read in a study that one should aim for 50 m³/h for 2 people). They said that this was all fine... what else should I do? I could probably say that I want more double units after all - do you think that would be sensible? Regarding the whole house, the air exchange is okay though... so about ~80 m³/h (there are four of us) + whatever the house ventilates natively

Thank you very much for your assessment! That reassures us a bit.

The overflow solution is for the utility room on the upper floor (where ironing and possibly sewing will take place) which otherwise is located on a wall with a sloping roof (1.6 m knee wall). How much gap does a door usually have? In our apartment, it is also about 1 cm, only that metal thresholds were always screwed in there.

No problem,

you just have to know what you're doing. Decentralized ventilation systems are really not bad and a very good alternative to central systems. As can be read in other threads, however, serious defects can occur with incorrect installation. And then you read that decentralized systems are rubbish, although that shouldn't just be left like that.

The question is simply how tightly the metal thresholds fit against the doors and seal them. I can't say much about that from a distance as a general rule. But maybe do the following:
In the dark, turn on the light and see how "strongly" the light shines through. You should see light clearly and not just a narrow edge. The more, the better.
Otherwise, it's just hard to assess in general.