Sound insulation - differences in interior doors?

I will install it myself anyway, so a carpenter is not an option for financial reasons. I think it will be an RSPK door with [Schallex Bodendichtung].

I think it will be an RSPK door with Schallex floor seal.

Ventilation system available?

Ventilation system available?

Yes.

I have read up a bit on the issue. Of course, I always have either exhaust or supply air in a room, never both except in the living/dining area.

Isn't the keyhole and the general leakiness enough to allow enough air to flow? So is it absolutely necessary to consider an overflow function with drop-down door seals?

Isn't the keyhole and the general leakage sufficient to allow enough air to flow? Is it therefore absolutely necessary to consider an overflow function with drop-down floor seals?

No and yes.
But that's not a problem. Talk to your door supplier. The frames can be made accordingly.

Great tip, I will provide a milling on the horizontal part of the frames so that air can flow over the frames.

Great tip, I will provide a milled groove on the horizontal part of the door frames so that air can flow over the frames.

... and also the sound that you want to keep out of the room with the floor seal