Citadel Enclosures is the parent company of Harris-Stolper and DFMZ Group, and serves as a driving force behind tailored, high-impact solutions in security, protection, and custom engineering across a wide range of industries. United by a mission to innovate and excel, Citadel Enclosures companies build high-quality enclosures that safeguard critical assets and support operational excellence.

At Citadel’s core are organizations such as Harris-Stolper - designers of custom cab enclosures for forklifts, specialty vehicles, and equipment - where operator safety and comfort remain paramount even in the harshest environments. Design Filtration Microzone, meanwhile, leads in precision-controlled air enclosures for life sciences and high-tech sectors, delivering essential conditions for delicate, mission-critical processes. Though they serve different markets, all Citadel Enclosures companies share a commitment to custom engineering, robust protection, and forward-thinking innov...