The MB-86EI is a system of thermally insulated, fire-rated windows, doors and partitions. It is designed to be used for building external fire compartments fitted with operable windows and doors and fixed partitions with a primary fire-rating of EI30, EW30 and EI15, in line with the PN-EN 13501-2 standard. The structure is based on our MB-86 system, meaning that it features high thermal and acoustic insulation, along with excellent water- and airtight parameters.