Fantech WC 15 Vari-Speed 5A Variable Speed Control w/ on-off switch (411102)

WC15

Although aesthetically pleasing, it's not ideal for consumer use because when you turn it on, it's on the full tilt setting - if you want to use the low setting, you'll need to turn the knob all the way. This is opposite to almost every consumer grade potentiometer that I'm aware of. Otherwise, it's built well and easy to install.