Comparison : Item # 9WG1212G102-E, 12V Splash Proof Square DC Fan (w.o Sensor)
Item # 9WG1224G102-E, 24V Splash Proof Square DC Fan (w.o Sensor)
Item # 9WG1248G102-E, 48V Splash Proof Square DC Fan (w.o Sensor)
Item # 9WG5748P5G001, 48V Splash Proof Round-Sidecut DC Fan (w. PWM Control & Pulse Sensor)