In other posts on fans and wiring its been mentioned that a 12V PWM case fan with a 12v AC to DC power supply can be used effectively to move air inside the fermentation chamber.
If I'd like to have the fan turn on during heating and cooling how would i wire this? In the above quote I'm not exactly sure what the wiring suggestion means. Can anyone elaborate please? Would I need a 3rd SSR for the fan or can I somehow utilize the two existing SSRs?