Hi
@SunnyDayinGA and welcome to the forum
I have come back to your post several times since you first wrote it, but I have to admit I don't have a good answer for you. Is the fan drying out the soil faster than usual? Are you creating some type of negative effect by exhausting without an intake? As I said, I really don't have a good answer for you, but I wanted to reply so you didn't think we were ignoring your post. Perhaps someone with better knowledge and more experience than me will come along with a better answer.
