Nope, they would all be seperate objects. If you are planning to use a lot of these objects ( like a spinning fan ) then I would create your own map file with XML that creates these objects automatically, you could just specify the file name location and handle all the rotation code that way.
So lets say I have moving platforms that translate across the screen. When this platform moves, the scene graph will require updating. Which Irrlicht scene node would I use to properly handle these moving objects?