Duct Fan Speed Adjuster

Hydrofarm's Fan Speed Controller was designed especially for centrifugal fans. This means it will help prevent damage to fan motors, ensuring longer life. (Meant for use with brushless motors, and all Hydrofarm inline fans, not booster fans) It will correctly and precisely adjust the speed of centrifugal fans without causing the motor to hum. These controllers are more sensitive than any on the market, and are compact and built to last. Features Internal, electronic auto-resetting circuit breaker State-of-the-art electronics throughout Rated for 15 amps 120VAC voltage capacity 1-year warranty   Hydrofarm Brand Other Brands Specifically made for use with fans and blowers, correctly manipulates input power sine wave for type of motors being controlled. Made for routers (different style of motor), incorrect clipping of input power sine wave leads to shorter fan life and excessive noise. Higher sensitivity control allows precise flow adjustments. Low resolution voltage control doe