Fire protection system
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Mullion and transom fire wall
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.
To obtain the optimum thermal and acoustic insulation, the continuous thermal break (insulator) made from HPVC and profiled glass pane gaskets from EPDM were used.
Panes and other infills are mounted in pane grooves shaped using mullion and transom profiles and a clamping strip. Additionally, the special expanding tape was used in pane grooves of mullions and transoms. The clamping strip is mounted to the supporting sections with a metric screw and stainless steel washer.
The maximum height of a curtain wall depends on the durability parameters from static calculations, however the construction should be divided with vertical thermal expansion joints on each storey. The maximum spacing and span of supporting profiles, at the assumed static arrangement, is determined based on static calculations of the construction and dimensions of infills. There is no limitation with regard to the curtain wall length when using the horizontal expansion joint.
For fire constructions it is possible to mount the MB-78EI doors in MB-SR50 EI façades, while at the same time keeping the fire resistance of EI30 or EI60.