UVGI Systems' range of in-duct air sterilisation units include single (ASU 2000 & 7000) and double (ASU 3000 & 8000) lamp rack models, multi-assembly units and modular systems (ASU 4000). Each model has been developed specifically for environments with poor outdoor air quality; servicing areas where patients may have compromised immune systems, and for re-circulated indoor air systems where there is a need to sanitise specific indoor spaces.