Controlled residential ventilation - Planning the positions for supply air / exhaust air

and why should one plan it that way when one still has all options available now?

Because the upper floor also works that way if executed professionally. The ground floor should be reconsidered, that is clear.

More is not necessarily the best approach.

Now we are supposed to determine the positions of the outlets for the central controlled residential ventilation.

Having the client just quickly take care of it like a wish list for spot outlets doesn't sound like a recommendation for the general contractor to me. From my perspective, this is classic specialist planner work, because it is more a matter of experience than taste.

First of all, apologies for my delayed response. And thank you for the many contributions.

That is still the task of a professional who knows the technology. You don’t just “place it anywhere.”

Absolutely right. I could imagine that the professional would also want to consider where the client intends to place their furniture later. Basically, I seriously question this task for us, since actually the planner should make the proposal. That’s why I am currently thinking more about communicating the requirements for the controlled residential ventilation itself and the roughly planned furniture layout with the request for suggestions regarding the positioning of the outlets.

I would take 2 x supply air in each room, in the hallway and pantry neither supply nor exhaust air.

In the 65 m2 area, I would place 4 supply air outlets.

Are you referring here only to the upper floor? If not, why should there be, for example, 2x supply air in a 14 m² children’s room?

I would try to place the supply air on the side opposite the door.

Yes, I think that is one of the basic rules that you should try to adhere to as well as possible. The attic has sloping ceilings with a knee wall about 1.20 m high. Unfortunately, in the case of the ceiling outlet, you cannot fully position it on the opposite side.

This hasn’t even remotely been planned by a professional, has it?

No, so far my wife and I have thought this through after agreeing on the basic planned furniture layout. :) Therefore, there is a high potential for amateur mistakes.

No, the air distribution is different as well. Depending on the design, there are also noise advantages. Also, huge air distributors may not necessarily be required. Which then saves space again.

Furthermore, excessive lengths of the ducts can be avoided this way, which positively affects flows and pressures and ultimately also the price overall.

Interesting. A good point that I will discuss with the planner.

Also, we lack size specifications for the valves.

All supply and exhaust air valves are designed for 20 m³/h, except for bathroom, bedroom, kitchen and living/dining area, which are each planned with 40 m³/h. At least according to the documents I currently have here.

More is not necessarily better.

What does the "more" refer to?

From my point of view, this is classic professional planner stuff, because it’s more a matter of experience than taste.

Yes, I completely agree with you, as I already explained at the beginning of my response.

This input already gives me a bit more confidence for the first detailed discussion with the person responsible at the general contractor. Many thanks!

What does the "much" refer to?

It is about the number of valves.

Exactly - so the only advantages lie in the reduced effort for the general contractor or ultimately the trade that installs the ducts?

Well, I was actually quite glad that our supply air vents are in the floor, as I didn't find wall outlets very appealing. Let's see how it looks in practice, but that will take a while.