Never heard of Early Durban, sounds like a relative of Durban Poison, which I got as freebies from a previous seed order. If that's so, then it looks Sativa-ish, big, thick stalks. I only got one to grow out of those (but that's probably because they were old unviable seeds, which is why they were giving them away as freebies). Not sure if it's male or female yet, don't even know what I will do with it, as I was planning on growing some Blue Mystic. If it's a male, I might breed it with the Blue Mystics. If it's female, I'll probably flower it.

The fan and filter sounds just right for your size box. My woman actually likes the smell of pot plants (as do I), but she doesn't like smelling it all over the house for the obvious reasons either. I went through the same thing.