Currently I have one fan pulling air over the cool tube 24-7 and I have another pulling air thought the carbon filter 24-7. I have 2 inlets one from the outside and one from inside. When is cool outside I pull air from the outside, for the summer I'm just pulling air from the room the cabinet is in.
The ducks are long so I can move the light around. I have the option with the reducer to suck air from outside the box when I need to up the CO2 I cool the light from external air source. I having trouble with my last two grows, I keep making heames