I had a eureka moment the other day.... I currently use a 5" RVK for extraction but was playing with a 6" one...
Now my extractor goes to a fan controller. Actually, the fan controller works my intake (4" RVK) & extraction too
Now I have no issue with fan hum on my 5" unless it reduces to an almost idle speed, then I hear it - slightly....
The 6" (yeah, the smallest one with the big capacitor on the side) - Hum baby hum! No use for me
However, my food for thought was, is it only the larger fans with the external capacitor that need variac controlling to prevent hum/buzz?
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