Duct Fan Speed Adjuster

Duct Fan Speed Adjuster

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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.


  • Internal, electronic auto-resetting circuit breaker
  • State-of-the-art electronics throughout
  • Rated for 10 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 doesn’t allow for proper adjustment of flow.
Stall speed range eliminated to eliminate fan stoppage. Allows fan to stall if fan speed falls.
Internal self-resetting circuit breaker in case of over-voltage. Must manually replace fuse and/or reset breaker switch, possibly leading to a scenario where your fan isn’t running for an extended period of time.
Made in the USA Made overseas

NOTE: Not recommended for use with non-Hydrofarm or non-Active Air fans or the 12" Max Fan (use speed controller CFH0350290 for the 12" Max Fan.)