ᐅ Are any modifications needed for interior doors due to a controlled residential ventilation system?

Hello. We are wondering whether the measures discussed in the forum regarding interior doors in connection with a mechanical ventilation system with heat recovery for air exchange are really necessary (e.g. cutting a gap at the bottom of the door, ventilated door frames, special transfer grilles, etc.). Air exchange must be ensured because of the Zehnder 350 mechanical ventilation system with heat recovery. Our general contractor said that some doors will remain open anyway, so all these measures are unnecessary. Of course, we would prefer the simplest and least complicated approach and just leave everything as it is. But then, does a mechanical ventilation system with heat recovery still offer any benefit?

Hearing about this for the first time. We are also getting a Zehnder system and will not consider any special requirements regarding the doors. Why would we, since an interior door is not inherently airtight.

Zaba12 schrieb:
This is the first time I’ve heard of that. We’re also getting a Zehnder system and won’t be making any special adjustments to the doors. After all, an interior door isn’t inherently airtight.

However, the gap is always mentioned. Air needs to circulate...
That said, I’ve never read anything about trimming the bottom of the door – the original post confuses me, and I can’t relate to it.

For standard interior doors, the gap at the bottom is sufficient. Measures are only necessary for SK2 level or higher doors. In the respective rooms, we simply implemented supply and exhaust air. This provided an elegant solution to the issue.

The doors are often slightly shorter, or the door frames are slightly routed at the top. In our case, the doors are slightly shorter.

ypg schrieb:
Yes, the gap is always mentioned. The air needs to circulate...
However, I have never read anything about sawing off – the original post confuses me, and I can’t relate it.

Then I’ll have to have a chat with our carpenter.

Learned something new again 😊