Extension hook for Velux windows

I needed to get my airbrush ventilation hose out the window, and this can be used to make that exact gap. But it is also useful to just keeping the window a bit more open for general ventilation.

Please be warned: this has to fit exactly to work (and required a lot of tweaking of the model). It appears that design changes on windows from at least 2015 does not fit this model.

Usage:

As shown on the image, slide the hook into the locking grooves.

You can now use the handle, as you would normally do when closing the window. Just now, you are locking it into the hook.