Hello, I saw some models need a fan some do not. Unfortunately I could not find in the specifications of the models which needs a fan and which does not. There are the models: ultra, advanced plus, advanced, and basic. I guess ultra needs a fan and basic does not. But how about the others? I am confused since they come without fan but most youtube videos run them with fan. My aim is to have a fanless system with descent speed. Which one should I choose? Thank you. Best, Algun
