ie e e

~USACE 2001!. The engineered systems used to protect building idealized 40-story building. A transient multizone analysis is per-occupants against biological and chemical hazards, whether they occur naturally or otherwise, are collectively known as immune-building technologies. Dilution ventilation, filtration, and ultra-violet germicidal irradiation ~UVGI! are among the only practical and cost-effective technologies available today that are suffi-ciently well-understood that can be accurately sized for air-cleaning applications. The performance of these technologies is investigated here to determine whether they are adequate enough to protect building occupants under simulated bioterrorist attacks on a typical commercial office building. The various methods available for the analysis of contami-nants in building air include single-zone models, multizone mod-formed using public domain software, which is capable of mod-eling the airflows in any multizone building, including infiltration