Comparison : Item # 109E1724K502, 172mm, 24V 1.30A Round DC Fan (w.o Pulse Sensor)
Item # 109E4724F402, 172mm, 24V 0.79A Round Sidecut DC Fan (w.o Pulse Sensor)
Item # 109E5712P5K04, 172mm, 12V 2.90A Round Sidecut DC Fan (w. PWM Control & Pulse Sensor)
Item # 109E5724H502, 172mm, 24V 0.58A Round Sidecut DC Fan (w.o Pulse Sensor)
Item # 109E1348G101, 127mm, 48V 9E Type 0.54A Square DC Fan