So, I am in the process of putting up the walls for my darkroom and I would like to plan for my ventilation needs. The room will be aprox. 18' x 13'. Here is the layout for the darkroom: The thicker walls are outside walls. In the bottom left corner is the air intake, which is going to be one of these darkroom louvers mounted near the ceiling. I was then planning on using pvc pipe with holes in it mounted to the back edge of both sinks, with some kind of suction fan going on. I figure I will need to run duct work to an outside wall where it can vent outside the house. Anyone care to correct me on this, or provide ideas on how to make it happen? While we are at it, any other words of wisdom before the darkroom is set in stone (or drywall as it may be)?