I'm going to build a diy cool tube using the bake-a-round tube. I'm hoping the 4" elicent will be enough to suck through a diy carbon scrubber (4" duct, 6" outside diameter, about 12-15" long, hung from top of cab) through the cool tube, then out of the top of the cab. My goal is to cool, ventilate, and deodorize with the one fan. I will also have at least one desk
fan blowing across the bulb/canopy.