My carbon filter fans are directly on the top of the tent and is vertical facing down sucking air straight up into the ceiling area.

So just worried by putting a fan in there will off-set the effectiveness of the carbon filter doing it's important job as putting a curculation fan in there may push the smell out the bottom of the vents of the tent.

That said every reply is towards pulling a cuclation fan in the tent so it's looks like i will work towards this.....''