Review on VIVOSUN Cordless Vent Blower Speed Adjuster 🌀 - Variable Speed Controller for Inline Duct Exhaust Fan by Diane Brown

Good product if you have a broken switch on your device. The levels between the performance are minimal. We bought this for a large fan that had a faulty control panel and were unable to find an exact replacement. This device allows us to bypass the faulty switch. The only problem is that the device we bought only allows two fan speeds that are approximately equally fast. I think this block would be good for other things.