ᐅ Soundproof doors for ventilation system D

Hello,
I bought a mid-terrace house from a developer that is currently in the interior finishing phase. For various reasons, I chose acoustic doors for the interior doors (part of the house will be used as a psychological practice room—a protected space—and the house will be a shared living arrangement for two middle-aged people, myself in my mid-40s and a co-houser).
I don’t want to hear everything the other person does in their bedroom, so an acoustic door seems like a good solution.

Unfortunately, the developer rejects this because of the ventilation system. Normally, the standard door has a gap of about 1cm (0.4 inches) at the bottom, allowing air to circulate.

How, or with which methods or doors, can I achieve acoustic insulation while still allowing the ventilation system to function properly?

Bertram100 schrieb:

How or with what methods or doors can I achieve sound insulation if a ventilation system must operate at the same time?

Airflow can be directed through various overflow openings, such as around the door frame on the right or left side, above the door lintel, separate ducts, ventilation grilles, and so on. However, some sound transmission is always inevitable. The gap beneath the door is usually the loudest point. I cannot say which solution would be best for your situation.

For effective soundproof doors with a drop seal, the ideal solution is to equip the affected rooms with separate supply and exhaust ventilation. Air bypassing is not an option.

Using the door frame or similar methods doesn’t make sense either. Routing through the wall is possible, but ensuring sound insulation there is difficult.

Either do it properly from the start or save the cost of expensive doors.

Well, there are bottom seals with sound insulation, and air permeability is possible, but usually only up to 27dB, which actually does not even correspond to SK1.

But I just wanted to mention it.

Only slight sound reduction here. If anything, I would go directly for SK2.
Or better to leave it as is and install somewhat "more solid" doors.
The wall construction should also be considered. Adjusting only one factor won’t make a difference.