Hydroponic Duct Fan Speed Controller

Hydrofarm's, duct fan speed controller, designed especially for centrifugal fans, helps prevent damage to fan motors, ensuring longer life, meant for use with brushless motors & all hydrofarm inline fans, not booster fans, will correctly & precisely adjust the speed of centrifugal fans without causing the motor to hum, internal, electronic auto resetting circuit breaker with state of the art electronics throughout.