Gerda manufactures internal doorsets that are simultaneously fire-resisting, smoke-tight and burglar-resistant. Its premium sixty-minute range holds ITB-KOT-2020/1280, fourth edition, issued in September 2022 and valid to September 2027, covering internal fire and smoke-tight doorsets with declared burglary resistance. Earlier fire assessments in Gerda’s own name include ITB-KOT-2018/0132 and ITB-KOT-2018/0145 for its steel doorset systems. The public website markets the residential range and cites only a quality-management certificate, so ITB’s register is the load-bearing evidence for this listing.