The roof vent isn't powered, it is just the flat pannet kind. As far as the steel floor goes.... We have prairie dogs and various other critters that dig into the chickem house. This finally stopped them. During the winter we have hard rubber mats, stall mats that we put down over the steel.
My coop has a steel floor. All I have to do is sweep and occasionally hose it out. I use a floor scrapper if anything is stuck. Use the DLM under the perches. I second the roof vent, makes a huge difference.