I found a nice video on YT about a polycarbonate panel with a drilled hole for any 15 cm air exhaust. The missing thing were the parts to connect the hose with the panel.
So there they are, modeled from scratch. I used the sliding mechanism from the air exhaust connector on my DeLonghi PAC95.
My printing settings are embedded inside the model files.
The author marked this model as their own original creation.