ᐅ Planning and Installation of Controlled Residential Ventilation as a DIY Project

In connection with my full renovation project (built in 1961), a mechanical ventilation system with heat recovery will also be installed in the building.
Since installing it in an existing structure is always challenging, I am currently trying to integrate the ventilation ducts as discreetly as possible into the ribbed ceiling. Most companies I contacted preferred surface-mounted installation, which is why I decided to handle this myself.

At last year’s Light & Building exhibition, I learned about the manufacturer Helios. Unfortunately, their business card got lost in the chaos of the renovation.
Therefore, my first question is: Does anyone have a contact at Helios where I could submit my planning for review?

Now to the project:
The mechanical ventilation system is planned to be installed in the attic.
This will be in a frost-protected area.
The air ducts to the vents will be routed within the insulation of the upper ceiling (attic floor).
The Helios room vents are designed for an airflow rate of up to 60m³/h (35 cubic feet per minute), as they can be supplied via two ducts (each 30m³/h (18 cfm)).
However, since I have frequently read that vent airflow rates should not exceed 40m³/h (24 cfm) to keep noise levels low, I have planned for two vents in rooms where more than 30m³/h airflow is needed (only one vent per duct).

I still have the following questions regarding balancing:
This is described quite well in the mechanical ventilation system manual.
- A differential pressure gauge is required for this -> can you recommend an affordable yet reliable device? How should I best create the measurement ports and seal them afterwards?
- How do I adjust the individual airflow of the vents?
This can be controlled by opening or closing the vent, but how can I ensure that the set value matches the calculated airflow?

Can anyone also comment on the overall planning (using mechanical ventilation easyplan)?
Does it look okay, or is there anything noticeable? (The ducts for the outdoor air supply [through the roof] are not included yet).

How do you handle pipes passing through beams and similar structures?

Since it is a concrete ribbed slab, a core drill was used.
This has already been approved by my structural engineer.

The pipes run inside the drywall partitions (or a boxed-in section) from the attic (through the upper floor) to the ground floor.

I find the exhaust vents above the toilets very close to the wall.
In the kitchen, could the exhaust vent be placed higher up?
Does the storage room downstairs not require any exhaust ventilation?

RotorMotor schrieb:

I find the exhaust above the toilets very close to the wall.

In the toilets, I will install the valve inside the wall (stud wall).

RotorMotor schrieb:

Could the kitchen exhaust be placed higher?

No, due to the routing of the pipes within the wall, I am unfortunately quite restricted in the placement on the ground floor near the kitchen/dining area.

RotorMotor schrieb:

Does the storage room downstairs not need ventilation?

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