Cat flap on KfW55 house with ventilation - experiences?

He uses the flap very gladly now...

Meal time
I am currently dealing with the same topic KfW 55 house and the same cat flap, as with you, should go into the window.
When our house is finished, a "tightness test" must be carried out. Was it the same with you? Or was your house already finished and did you install it yourself afterwards?
Thanks in advance for an answer
Tostbert

The airtightness test for a kfw 55 house without ventilation is a joke anyway! 3x air exchange of the volume per hour is the limit

As far as I know, 1.5, Passive Houses 0.6. But it's best to check with the KfW

Meal time
I am currently dealing with the same topic KfW 55 house and the same cat flap as you want to install in the window.
When our house is finished, a "leak test" has to be carried out. Was that the case with you as well? Or was your house already finished and did you install it yourself afterwards?
Thanks in advance for an answer
Tostbert