Control Freak 7 Amp Dynamic Frequency Fan Speed Controller Beneficial Inoculants Supplementing with CO2 can be

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Control Freak 7 Amp Dynamic Frequency Fan Speed Controller Beneficial Inoculants Supplementing with CO2 can bePlease note: This item is purchase to order. Be a Control Freak! The Next Step Up From the Hybrid Fan Speed Controller! The Control Freak combines the best of both types of conventional fan speed controller giving you the quietness and smooth output of a hybrid type while giving you the controllability of a standard pulse width modulation (PWM) type. Standard fan speed controllers produce a spiky waveform which usually introduces a hum in the fan