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A system model was developed that used the performance characteristics of ECM and SCR FPTUs (fan-powered terminal units) that were measured by Furr et al. (2008), Cramlet (2008), and Edmondson et al. (2011). The measurements from laboratory experiments combined with the sensitivity analysis indicated that the ECM(electronically commu tated motors)-controlled motor can have a substantial positive impact on the system performance as well as the overall energy consumption. Consideration should also be given to what happens to the SDVAV(single-duct variableair- Volume) system during low-load conditions when one of the terminal unit fans turns on: there is no change in the system static pressure. The results from the simulation showed: 1. The systems with the series ECM FPTU used an average of 6.7% less total plant energy than the systems with the SCR-controlled FPTU. 2. The increased energy efficiency from the ECM motor reduced the heat load on the system enough that the primary airflow required to handle the motor load was small and a net decrease in primary fan energy was realized. 3. The average net decrease in heat added during heating and terminal unit fan energy was 7.9% and in Phoenix, the city with the greatest cooling load, the savings was over 10%. The results of this study show that paying a premium cost for an ECM fan motor in a series terminal unit will provide significant cost reductions in energy use. Current conventional wisdom is to install this technology for both parallel and series FPTU applications and to prefer parallel FPTU over series FPTU. These results indicate that for the series FPTU application, the additional cost is warranted when the FPTU is operated as a CAV device and that there is a potential of over a 10% reduction in the total plant energy use of the systems that use ECM FPTU versus the SCR-controlled FPTU.