Comparison : Item # 9RA0812H1001, 12V Ribbed Square DC Fan (w. Pulse Sensor)
Item # 9RA0624H4D001, 24V Ribbed Square DC Fan (w. Lock Sensor)
Item # 9RA1212P1K001, DC Fans Axial Fan, 12VDC, 158CFM, Low Noise, Ribbed, Ball, Wire, Tach/PWM
Image