Duct Fan SPD 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.