The hose is approx. 1.5 m (I can't be more precise because the part is currently in a different place). Clamping it in the window works. However, if a window is open, warm air comes back into the room. In addition, the intake is exactly on the side of the hose, so that the warm outside air is potentially sucked in. I think the part is good, but I didn't think about all this enough beforehand. A much better solution would certainly be to have a hole to the outside somewhere.