Acoustically insulating doors in ventilation system D

Hello, I bought a terraced middle house through a developer that is currently in the interior construction phase. For various reasons, I chose acoustic doors for the interior doors (part of it will be a psychological practice (protected room), the house will be a shared apartment for 2 middle-aged people (me, mid-40s, and a co-houser). I don't want to hear what the other person is doing in their bedroom. For me, the acoustic door seems to be a good choice. Unfortunately, the developer rejects them because of the ventilation system. Normally, there is a slot of about 1 cm under the standard door through which air can circulate. How or with what means or doors can I achieve acoustic insulation when at the same time a ventilation system has to do its job?

How or with what means or doors can I achieve acoustic isolation if at the same time a ventilation system has to do its work?

Airflows can be guided through all kinds of overflow openings. For example, through the frame on the right/left, lintel, separate ducts, ventilation grilles, etc. But some sound will always be transmitted, that cannot be avoided. The gap under the door is, however, the loudest variant. I cannot say what the best solution is for you, though.

For proper soundproof doors with a floor seal, the ideal solution is to equip the affected rooms with separate supply and exhaust air. Overflowing is not an option. Passing through the frame or similar does not make sense either. Through the wall is a possibility, but ensuring soundproofing there is difficult. Either do it right from the start or save the expensive doors.

Well, there are bottom seals with sound insulation and air passage, but usually only up to 27dB, which actually doesn't even correspond to SK1.

But I just wanted to say that.

Only slight sound reduction. If anything, I would go straight for SK2. Or better leave it as it is and install somewhat "more stable" doors. The wall structure should also be considered. Just adjusting one tuning screw won't do any good.