Variac thermostat setup

When I check on her shortly ill snap a pic of it...- STELTHY:leaf:

Is it an SMS fan controller?

As they’re not variac controllers. So you’ll still get a certain amount of hum.

I use the single fan speed controller from sms. When you set the idle speed to the lowest you get hum but at 1/4 of the idle selector there’s not much Hum at all with my system air RVK150A1.
 
I have found this on the picture but from this thread below

seem interesting tho I don't understand what means at the very end swap to the orange does understand?
 

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