I have passive intake and Jerry-rigged passive intake on bottom so there are no light leaks.

This is the exact type of fan I bought and am using for my grow.
The price was right and they work just fine.
I actually mounted them onto a board in my tent. You can see them both in the upper right of my tent on this photograph if you look closely.
I like the idea of organic weed.
Seems the least complicated and I may not get the highest yields or the biggest buds but I think I can get some real quality smoke.

Honeywell HT900C TurboForce® 7″ Power Air Circulator, Black, with 90 Degree Head Pivot, Eco-Friendly, and Easy to Use Fan