Innovative prefabricated front inspection box for roller shutters, totally customizable to every need. Adaptable to any masonry, its soul-sintered expanded polystyrene (EPS) - treated with cement premix - ensures excellent thermal-acoustic insulation performance and facilitates installation. Its distinctive feature is the closure that protrudes out of the plaster to ensure better coverage. The closure is made with a double wooden cap: an OSB insulation panel coupled to an MDF finishing panel, the latter is pre-treated with cement to facilitate final painting.