The MB-SR50 EI mullion and transom wall system is designed for the construction of lightweight flat fire curtain walls of a hanging and filling type, with a fire resistance of EI15, EI30, EI45 and EI60 according to PN-EN 1364-3. The system is classified as non fire-spreading (NRO).
The system design is based on the supporting frame construction comprised of vertical (mullions) and horizontal (transoms) aluminium box sections with a characteristic width of 50 mm.
The mullion and transom profiles are suitably joined with each other and form an aluminium grille structure, which is mounted to the building’s construction by means of appropriate supports.
To obtain the fire resistance of aluminium sections, mullions and transoms are fitted with special fire-proof inserts. The insert consists of an aluminium section with a relevant shape, which acts as a reinforcement, covered by fire-proof plates.
The construction designed in such a way enables the use of standard mullion and transom sections used in the MB-SR50 system, which to a large extent has improved the cost-effectiveness of the whole construction.
In the MB-SR50 EI construction, mullions with a depth of 85-185mm and transoms with a depth of 65-145mm have been used.
The overlay joint of mullion and transom is envisaged in the system to ensure effective water drainage and ventilation of glazing cavities.