Dornhöfer is a Rhine-Main electrical and mechanical services contractor whose fire protection division installs sprinkler systems, deluge systems and low-pressure water-mist installations, including foam-injection variants. The company publishes its VdS Schadenverhütung recognition numbers for its Mainz-Kostheim location — E 4780016 for sprinklers, E 7870008 for deluge and E 20100009 for low-pressure water mist — and VdS also certifies it as a Fachfirma nach DIN 14675 for fire alarm and voice alarm systems. Design is additionally offered to NFPA, FM and IRI rule sets.