Aire Technologies, Inc. specializes in rapid manufacture and delivery of HVAC fire protection products. Our fire dampers and ... ceiling radiation dampers (CRD) serve a dual purpose. Their design slows the spread of fire and allows additional time for the occupants of a burning building to escape. Local and national codes and regulations such as NFPA and SMACNA mandate installation of specified fire protection products. Aire Technologies fire dampers and CRDs are UL classified. read more