Noisy Inline Fan speed controller

Sparkitus said:

Evening, wondering if anyone could help -

I have a 5” inline exhaust fan and when it’s running direct to the mains it is silent except for the sound of the air movement, which isn’t an issue. However, I only need the exhaust on low most of the time and when I use a cheap speed controller it makes the fan buzz quite loud - is there a higher quality speed controller with temp setting that will eliminate this buzzing - I think it is something to with the way the current chops in and out but it’s not really something I know much about.
If anyone has a suggestion it’s greatly appreciated

Click to expand...

1212ham said:

A variac transformer is needed for good controll of AC fans but there are much better options. I use an AC Infinity fan and their Controller 67.

Several companies have DC fans and controllers that can vary speed based on temperature/humidity and control other devices like humidifiers etc., all managed by a phone app. AC INFINITY probably has the best consumer level controllers but there are several others.

Click to expand...