Controlled residential ventilation planning / installation as own work

In connection with my major renovation project (BJ‘61), a controlled residential ventilation system is also to be installed in the building. Since installation in an existing building is always a challenge, I am currently trying to accommodate the ventilation ducts as inconspicuously as possible in the ribbed ceiling. Most of the companies I contacted preferred surface-mounted installation, which prompted me to implement this myself.

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At the Light&Building fair last year, I came across the manufacturer Helios. Unfortunately, the business card got lost in the hustle and bustle of the renovation. Therefore, my first question: Does anyone have a possible contact at Helios where I can submit my planning and have it reviewed once again?

Now to the project: It is planned to install the controlled residential ventilation system in the attic. This will take place in a frost-protected area. The air ducts to the valves will be laid here in the insulation of the upper floor ceiling (attic floor). The Helios room valves are designed for a volume flow of up to 60m³/h, as they can be operated with two ducts (each 30m³/h). However, since I have read quite often that you should not exceed 40m³/h at valves in order to keep the noise level low, I have provided two valves in rooms where more than 30m³/h volume flow is required (always only one valve per duct).

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Regarding balancing, I still have the following questions: This is described quite well in the manual of the controlled residential ventilation system. - A differential pressure measuring device is needed for this -> can you recommend an inexpensive yet good device? How do I best create the measuring openings and then seal them again? - How do I set the individual air volume of the valves? This can be adjusted by opening and closing, but how do I ensure that the calculated value is actually set?

Can anyone also say something about the general planning (using controlled-residential-ventilation-easyplan)? Is this okay as it is, or does anything stand out? (The ducts for the outdoor air [via the roof] are not yet included) [ATTACH alt="Helios_01.png"]80543[/ATTACH] [ATTACH alt="Helios_02.png"]80544[/ATTACH] [ATTACH alt="Helios_03.png"]80545[/ATTACH] [ATTACH alt="Helios_04.png"]80546[/ATTACH]

How do you handle the pipes going through beams and so on?

Since it is a concrete ribbed slab, using a core drilling.
This has already been approved by my structural engineer in this way.

The pipes run inside the drywall walls (or a boxed enclosure) from the attic (over the upper floor) to the ground floor.

The exhaust air above the toilets seems very close to the wall. In the kitchen, could the exhaust air be higher up? Does the storage room downstairs not need any exhaust air?

The exhaust above the toilets seems very close to the wall to me.

In the toilets, I will install the valve in the wall (pre-wall).

Could the exhaust in the kitchen be higher up?

No, due to the routing of the pipes inside the wall, I am unfortunately very limited in the placement in the kitchen/dining area on the ground floor.

Does the storage room downstairs not need exhaust?

I thought I could save myself this small room since the pipe routing there would also be very complicated. The access is a sliding door, which is not really airtight anyway and is opened several times a day.