Thanks for the information. My tent is a vivoson 48×48×80 and I'm using the vivoson vs4000 led. With 6 inch inline duct with fan kit and carbon filter. I also have a humidifier and dehumidifier set up on a Rain Bird climate control. I'm running to fans. And I have my vents covered because of the light that would come in. I'm getting fresh air with one of the holes that you're supposed to send the chords Through I put a 8-in piece of PVC pipe through it if you get fresh air that way