Airflow methods in controlled residential ventilation all through door gaps?

Hello everyone,

I am currently reading up again a bit on the controlled residential ventilation issue. In this context, I came across the following site that seems competent to me (even though the construction project dates back quite a few years):

It is about the airflows in the house with controlled residential ventilation. So far, I have always assumed that the outflows from a supply air room to a transfer room/passage to an exhaust air room primarily take place through the door gaps between the floor and the door.

Now I have seen the following graphic and perspective on the aforementioned site:


How is it possible to realize that, for example, in the bedroom air can flow out at the top without a wall breakthrough and an additional valve? Or is this not necessary because it would have a negligible effect on the bedroom temperature and you all have it—like in every room, right?—realized through the lower door gap?

Does something like this practically have to be installed in the bedroom? With regard to the optics


How many mm / cm are actually sufficient there? Because this door gap at the bottom is again a disadvantage in terms of sound insulation.

Many thanks for your suggestions and experiences.

Anna.

That is negligible. You can install overflow valves or door seals with overflow capability. However, you don't have to.

With [Kontrollierte-Wohnraumlüftung] you can neither cool nor heat.

Thank you for your quick response. Yes, you cannot cool and heat, but I could already imagine off the top of my head that it would make a difference of a few degrees or at least after the decimal point (whether the warm air is transported away or the cold air stays on the floor). But of course, whether that is negligible or not.
Is the standard door gap under an interior door sufficient, or is that considered separately?

I think you are getting a bit lost in the details. Overflow valves are now rarely used. Who plans the controlled residential ventilation at your place, the position of the valves, supply and exhaust air...? They should know what they are doing. And it doesn’t (matter much) in terms of temperature. The controlled residential ventilation has a heat exchanger. If the exhaust air is warmer, the supply air will also be warmed more. Additionally, with normal design you are far from creating any cooling effects. The normal gap is sufficient. As mentioned, the flow is comparatively low. More complex but also more controllable is to install more separate supply and exhaust air positions and fewer overflow areas. But this is absolutely uncommon so quickly forget it.

Yes, it may be that I am spending too much time on the matter. So far, we have not yet decided whether to plan it through Selfio or the manufacturer themselves. Or even by the company that also does electrical / heating? Everything is still unclear so far. But thanks

You are doing it exactly right. Inquire beforehand and not: "One-time checked ventilation system please" and afterwards: "I didn't order that"