The INSIDE U800 is a fireplace prepared for installation in a prepared recess. It is the most developed version of all models available for installation. The frame of the fireplace is equipped with a venting system that prevents the creation of pressure under the burner in the event of a fuel overflow. The frame of the fireplace also has a built-in insulation that allows safe installation in, for example, plasterboard and MDF. This fireplace can be a beautiful and effective combination between two rooms.