Tjernlund SCP Plug-in Fan Speed Controller - Adjustable Brown Fan Regulator for Home, Office & Workshop Ventilation | Perfect for HVAC, Exhaust Fans & Air Circulation Systems

Nice to find a US-made item these days, and a nicely manufactured one at that - a rare occurrence to say the least. Now yes, as some have pointed out there is a buzz, and it will get increasingly more noticeable the lower (clockwise) you turn the dial to obtain a slower fan speed. But this did not present an issue while used in conjunction with MY PARTICULAR 40" TOWER ROOM FAN, meaning it may just come down to the use with YOUR particular fan, and plugged into an outlet of YOUR newer or older home (my home was built in 1956), and YOUR newer or older house or structure wiring (electricians, can this have an affect on this buzzing noise?).For my fan which is already a 3-speed fan, I found even the lowest of the speeds was still just too forceful as well as loud in my small bedroom, and wanted to find and try this Tjernlund speed module. Now, with my fan set to it's lowest speed, and the Tjernlund just barely turned approximately 1/3 of it's range from the "ON" position ("ON" is just a click clockwise from the "OFF" marking), my fan speed reduced to just the right amount of airflow and sound reduction that I was hoping for! And yes, I do notice a very slight "buzz" at that low adjustment setting, but not enough to bother me since the modest and comfortable fan noise almost completely overcomes that buzzing. And if I continue turning this dial clockwise to slow down my fan even more, yes the level of buzzing will get louder, but in MY case I have no need to do so. So again IMO, it really will depend on your needs and your intended use with your particular fan or blower. My combination worked out well.I should add that after I turn off my fan, I still hear a slight electrical current sound if the Tjernlund is still in the "ON" position, so I just click it "OFF" when not in use. Now, if you also notice this sound and it bothers you and you'd like to be able to "remotely" switch off the power at the outlet to the Tjernlund, you may be able to utilize one of the many wireless remote control plug-in outlets between the wall outlet and the Tjernlund, and I may end up trying this as well so I won't have to get on my knees to turn off the Tjernlund when not using my room fan.I WOULD DEFINITELY recommend this Tjernlund unit - you will just have to try it out for your particular application and see if it works to your satisfaction like it did for mine. :-)