Yeah, get those pics up. It's obviously not going to be the most efficient exhaust system ever created :stoned:... but it could pull some air out of there. What if you let some small duct work run up the inside of the cab to the top, near the lights? The fan would be outside the box... it would be pulling air from the top... down the duct work... through the floor... out the back speakerwire input hole. Get a decent fan and it may work out. Although, the more elaborate your creation... the less stealth it becomes. It will also take up some of your available grow space since you would have duct work inside the cab.

Just brainstorming... :jointsmile: