Aluprof S.A.


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.

Fire protection and smoke exhaust systems - General information

A wide range of systems offered by Aluprof facilitate a variety of structural elements that are responsible for “fire protection zones” in buildings, and provide the right conditions for evacuation of its occupants. These solutions include both a window wall & door system option, extending to a typical “stick assembly” curtain wall system solution. The fire resistance performance of these solutions, depending on the project requirements, are available in a variety of classes, from as low as EI 15 (15 minutes) up to a an EI class of 120 (2 hours) for vertical assemblies, and achieve a class of REI 20/ RE 30 for roof glazing.

The following solutions, categorised by their common fire retardant properties, are responsible for the safety of a building’s occupants during a fire: MB-78EI internal & external partition walls & doors (classes EI 15 to EI 90), MB-78EI DPA automatic sliding doors (EI 30), MB-118E fire walls (EI 120), MB-SR50 EI and MB-SR50N EI curtain wall (classes EI 15 to EI 60), MB-SR50 EI EFEKT and MB-SR50N EI EFEKT curtain walls (classes EI60), glazed fire roofs (RE 120/ RE 30), MB-45D smoke-tight door & smoke exhaust windows & valves.

An important feature of the Aluprof fire rated solutions is their ability to interface with each other, one system to the next, whilst maintaining the necessary fire resistance. This is demonstrated with the integration of the MB-78EI door into the MB-SR50 EI and MB-SR50N EI curtain wall, enabling the whole structure to achieve a common EI 30 or EI 60 class performance. The same MB-78EI door possibility exists, with implementation into the MB-118EI wall system.

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