Köhler & Bandl GmbH & Co. KG develops and builds steel fire doorsets, sliding fire gates, smoke-control doors and multi-purpose steel doors at Schloß Holte-Stukenbrock in East Westphalia. Its T30-1-FSA and T30-2-FSA and T90-1-FSA and T90-2-FSA types are fire-tested to DIN 4102-5 and covered by DIBt allgemeine bauaufsichtliche Zulassungen of the Z-6.20 series, including Z-6.20-2055. The company has supplied fire-rated door and gate packages to retail distribution centres.