The fire door is characterised by a three-chamber system that has been specifically developed for internal and external fire doors and walls. To ensure high thermal insulation, 35 mm wide thermal breaks are used. The system offers a variety of door leaf designs, the possibility to create smoke-proof, curved and large-scale structures. It is also possible to combine this system with other EI30 and EI90 fire systems by using the same 78 mm deep sections, as well as with EI120 fire systems by using adaptive sections. It is possible to produce internal and external doors on exits and escape routes using this system. It also carries the Current Classification in fire resistance and a National Technical Assessment.