Ε61 system is a patented versatile and multifunctional chamber, branded as ETEM MultiBox. MultiBox patented design allows us to extend the existing frame, opening sliding system, in any direction, horizontally or vertically, with a thermally insulated chamber in which we can add a selection among a shading, security, or rolling shutters system. MultiBox can also be used for other application in a building that require thermal insulation and have to be integrated with other systems. Such examples may be: – Lighting systems and lights. – Water Pipes – Tubing for heating and cooling. – Main entrance tv-monitor systems. – Mail box systems. Advantages – The versatile MultiBox is manufactured from thermally insulated profiles, providing high thermal insulation of the doors and windows. – An elastic diaphragm is placed along the versatile MultiBox and thus achieving improved sound insulation. – The multifunctional MultiBox can be installed together with the frame and as a result, the integrated system can be placed at a latter time within Multibox. – MultiBox is designed in such a way to offer quick and easy access inside, without requiring special tools. – MultiBox can also improve aesthetically and offer thermally insulate steel hollow sections that are often used for static support of large frames in a building.