The MB-60E EI system is used to make internal or external doors single and double leaf fire protection systems. This system also enables execution the so-called technical windows and fireproof partition walls. Structures made on the basis of the MB-60E EI system may have resistance classes fire resistance EI 15, EI 30 according to PN-EN 13501-2 + A1: 2010. The system is classified as fire retardant (NRO).