This paper is based on findings resulting from ASHRAE Research Project RP-1223.In this study, aerodynamic performance was measured experimentally for three propeller fans subjected to systematic variation of inlet flow components. The inlet conditions were intended to simulate installations of fans typically encountered in the field. The aerodynamic performance penalties associated with the various appurtenances were characterized in terms of system effect factor (SEF). (Also published as "Aerodynamic Performance and System Effects of Propeller Fans" [HVAC&R Research, vol. 15, no. 2, March 2009, pp. 231-254])Units: Dual