ᐅ Controlled residential ventilation: Placement of supply and exhaust air in my designs

Hello,

could you please review our plans regarding the supply and exhaust air locations?

I’m quite overwhelmed. Visually, the vents don’t look good at all, but they have to go somewhere. What is the most elegant way to solve this?

Do you think this layout is good?

At first glance, the supply air position in the living room (ground floor open plan, left side) stands out. The sofa will be placed directly underneath it...

Also, on the upper floor, there are three supply air vents on the floor. I find that rather unattractive and I’m concerned it might be inconvenient for cleaning.

Is it possible to simply change these floor vents on the upper floor to ceiling vents, or would that involve significant additional costs?

I would appreciate your feedback.

Thank you in advance!