1. What is the difference between out wall and in reveal shutters? In case of an in reveal roller shutter the box guide and the curtains are all installed within the window opening. This means that when you look at your house from the outside you can see guide and box. On the other hand, on wall shutter is installed by making the box sit above the window opening while the guides sitting outside the opening of the window. 2. How is the roller shutter controlled? There are several ways the roller shutters can be controlled. Most of the residential ones are operated manually through a winder or strap box. However, the electric ones are controlled using switch or remote.