Comparison : Item # 9SG5724P5H61, 24V Round-Sidecut DC Fan (w. PWM Control & Pulse Sensor)
Item # 9SG5748P5G01, 48V Round-Sidecut DC Fan (w. PWM Control & Pulse Sensor)
Item # 9SG5748P5H01, 48V Round-Sidecut DC Fan (w. PWM Control & Pulse Sensor)
Item # 9SG1224G105,