Ventilation concept

I am thinking about the ventilation concept in a house with two full floors plus an attic.

Attic: This is accessible via a pull-down ladder and is not intended to be used. We would place the ventilation system here and easily serve the first floor from there. For this purpose, the top filigree ceiling will be ordered together with the corresponding placeholders for ceiling vents.

Now the question arises how the ground floor can best be supplied. The conversation with a heating technician revealed that he recommends laying the pipes in or on the ground floor ceiling in order to reach the rooms on the ground floor. Sounds logical at first. However, there is a long corridor spanning the entire width of the house on the ground floor. All the rooms on the ground floor are accessible from this corridor. Now the alternative idea was whether to suspend the corridor ceiling, accommodate ventilation pipes there, and then branch into the rooms. However, this does not mean that each room ceiling would have to be suspended; rather, the walls would be penetrated from the corridor and ventilation long-throw vents would be used. Anyone have experience with this? I only know these from industrial halls and wonder if they are just as efficient and silent as regular ceiling vents. Does that make sense? Can you save something? (Pipe lengths would be reduced after all)

Thanks & regards

I can't imagine that it is cheaper. Additionally, you also lose ceiling height in the hallway.