Comparison : Item # 9HV0612P1J001, 12V Ribbed Square DC Fan (w. Pulse Sensor & PWM Control)
Item # 9HV0412P3K001, 12V Square DC Fan (w. Pulse Sensor and PWM Control)
Item # 9HV0812G1002, 12V Ribbed Square DC Fan (w. PWM Control)
Item # 9HV0824G1D001, 24V Ribbed Square DC Fan (w. Lock Sensor & PWM Control)
Item # 9HV0848P1G001, 48V Ribbed Square DC Fan (w. Pulse Sensor & PWM Control)
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