ᐅ Ventilation for Rooms Without Windows

Hello,

We have just built a KfW70 prefabricated house. We do not have a mechanical ventilation system, but in all windowless rooms, a room ventilation system has been planned. This runs through the roof for interior rooms and through the wall for the pantry.

In a small bathroom, we have a fan (as expected), but the ventilation in the other rooms is simply a pipe leading to the roof. In the pantry, there is even just an approximately 10 cm (4 inch) hole in the wall, which is supposed to be covered on both sides with a plastic cap.

Is this normal? What is the use of the best insulation if we have holes in the walls and leading to the roof? And won’t this cause extremely poor results in the blower door test?

What is the point of a new building with so many rooms without windows? There must have been a mistake in the floor plan design.

Why several? We have a pantry, a small restroom, and an additional storage room in the granny flat.

Could it be that this is the venting of the water pipes rather than ventilation of the room?

No. The plans clearly specify room ventilation. As mentioned, there is simply a hole about 10cm (4 inches) in size in the wall of the pantry, where a plastic exhaust vent will be installed.

Good evening,

bambulko schrieb:

In a small toilet, we have a fan (just like you would expect)

Who sells or installs something like that?

Regards, Bauexperte