I just picked up this (very heavy) old incubator. I have no idea anything about it. The owner siad it was a Humidair Drum-type, and it was expensive when it was new. He was getting out of chickens. It looks like it is all there. Needs some work. It's my winter project. I'd be happy if I could figure out how to have it hatching eggs before winter is out for spring chicks.