Central Controlled Residential Ventilation: Supply and Exhaust Air, Door Bottom Gap

The same amount of supply air and exhaust air is planned on every floor. To avoid overpressure or underpressure and strong drafts in the house.

Supply air is normally provided in living and sleeping rooms. Exhaust air in the kitchen, bathrooms, laundry room, etc.

In the basement, I also find supply air important; it helps with drying laundry. Items stored in the basement also do not start to smell musty (documents, clothing...).

We have Zehnder.

EG
Kitchen, WC, Utility room - exhaust air
WZ - 2x supply air

OG
Bathroom, Office/Dressing room - exhaust air
2KZ, Bedroom supply air

The planning was done by a FA.
minimum door gap 8mm

Exhaust air in utility room and dressing room has been throttled so that more air is extracted in the other damp rooms.

We ordered it together with the general contractor and a company planned and installed it: Vaillant recoVAIR Supply air ground floor: 2x living room, office Extract air ground floor: kitchen, bathroom Supply air upper floor: children's room 1, children's room 2, bedroom, dressing room Extract air upper floor: bathroom Additionally, in the utility room in the basement, a valve is installed in the extract air duct so that air is also extracted here.

Opinions on the floor gap (5mm seems normal to me)?

It also works without a floor gap (forum search, otherwise ask again).

Also have no floor gap, but the ventilation gap in the frame. Works well.

Isn't a gap like that (no matter where) an acoustic problem?