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ALPE doors are designed for indoor and exterior applications. It is a door solution, designed to provide specific performance parameters including : fire resistance, burglary resistance, acoustic and thermal insulation performance. ALPE doors are steel d oors with a shell structure (glazed or not). The filling is mineral wool. ALPE steel doors are used in the construction industry to close openings in vertical partitions with declared fire resistance class EI30 and smoke tightness in the case of ALPE EI30 doors and dampers, with the declared fire resistance class EI60 and smoke tightness in the case of ALPE EI60 doors and dampers, general use without declared fire resistance and smoke tightness in the case of ALPE BO doors.