Quote Originally Posted by GetThisOrDie
Whats up everyone..

Got all my new gear in finally and had some questions for people who use speed controllers...

I got a 10" inline fan to cool my hood (600w) and a fan controller to slow it down for less noise. The only problem is that when using the speed controler to slow it down the fan makes a loud buzzing noise but still works as intended. Was wondering if this is normal?
Yep, it's the nature of the beast.

I'm guessing your using something similar to a "Speedster" electronic controller, that varies line frequency. Some fans are better than others, but they will all *buzz* to some extent when throttled down.

If it is really objectionably loud, check to see if there is excessive shaft clearance on the fan. With the fan OFF , see if you can wiggle the impeller around. If it's wobbly, you oughta ask about a replacement.