Central ventilation system control completely through the attic?

Hello everyone, I registered here because we are planning a bungalow. Currently, two questions remain open: besides the heating system (at the moment we tend to choose a brine-water heat pump with ground collectors or ring trench), it is the ventilation system. At first, we thought of a decentralized system because we ventilate a lot anyway and considered it as an addition. After deeper engagement with the topic, however, we realized that you probably cannot ventilate so much and above all in a controlled manner, but a continuously running decentralized ventilation could be disturbing due to noise.

Therefore my question: We are planning a bungalow with an intermediate ceiling made of wood, insulation in the ceiling, attic not developed, parts of which we want to use as storage, for example for Christmas stuff, etc. Before I enter into deeper discussions with the installer, I would be interested to know if a loose installation of the pipes in the attic with introduction through the suspended ceilings makes sense? This would have the advantage that we could access the pipes at any time, which gives us a somewhat secure feeling. Another general contractor had suggested installation in the screed; except for the general contractor, we have not yet spoken with the currently commissioned companies.

Thanks for your tips!

With a different search, I have now found a suitable post here: , so I will read into it first. The device itself is supposed to be located in the utility room, not in the attic.

That would have the advantage that we could access the pipes at any time, which gives us a somewhat secure feeling.

You won't get to your pipes that easily, because you have to insulate the pipes if they are outside the thermal envelope.

And yet you can access the pipes, if necessary cut open the insulation and reseal it with, for example, aluminum adhesive tape (if mineral wool with aluminum foil facing was used for insulation).

Although you shouldn’t need to access it anymore. I checked mine with a probe after about 7 years and found nothing.

The system only gets loud if too much air is transported through a channel/pipe. I don’t remember the exact "critical" limit anymore but at >2m/s air velocity everything should be fine.

Sound attenuators in front of every outlet in the attic work wonders, otherwise it can happen that you can understand what is said somewhere in other rooms.

Oh yes, throttle valves in front of every outlet in the attic can also be recommended as it makes balancing easier when adjusting the air amount pushed through the pipes.

A filter for outside air protects the unit inside from coarse dirt. A supply air filter keeps the pipes nice and clean and if it is an F7, pollen is also no longer really a problem. An exhaust air filter in the outlets (usually G2) also keeps those nice and clean.

How thick do you wrap the pipes then? Honestly, I can hardly imagine it right now.

Min. 30mm mineral wool aluminum laminated, but rather more.