Review on Black Derale 16749 Fan Controller with Adjustable Settings by Shah Nelson

Works great and adjusts to proper fan start temperature. I bought two because I also bought a dual speed Derale fan, thinking it would be better to have two controllers in case one fails. The problem I have is that the fan controller runs on the negative side instead of the positive side so I could only use one controller and ended up with a single speed fan. Luckily I made a custom shroud so all I needed was low speed anyway. Now I have a spare controller in case the other one fails, so I'm still protected if it fails :-)