Vent what? The spray booth? There is a skylight, you can see it at upper right in the panoramic photo. The spray booth has a hose on the back with a flat plastic thing on the end; I open the window, put the thing through it, and trap it by closing the window again as far as it will go. One downside of this arrangement is that the window faces south, the prevailing wind direction here is southwesterly, and we can get quite fierce storms in autumn and winter — meaning I may have to postpone my airbrushing for a few days sometimes