BTR Brandschutz-Technik und Rauchabzug Harz GmbH supplies, installs and maintains smoke and heat exhaust equipment and runs the BTR Brandschutz-Service-Center, which delivers DIN 18232-10 certification for planners, installers and maintenance firms in partnership with the RAL-Gütegemeinschaft Rauch- und Wärmeabzugsanlagen. The company is a GRW member holding the RAL-Gütezeichen for RWA installation and maintenance, and trains fire protection technicians in RWA, Feststellanlagen and DIN 14677 servicing.