Air flow direction has to match up. I'm not sure if those have integral booster fans in them but if they do, check the direction and mark it on the thing somewhere.
stinkyattic Reviewed by stinkyattic on . Cool Tube Users - a ????? I just built a 3'D x 6'W x 4 1/2'H grow cabinet to be used for vegging. I've got two 400w MH bulbs in cool tubes. Below are three photos representing the three different ways I could hook the cool tubes together. Which configuration would be best? A photo of my cabinet after I finished drywalling the outside - not that I'm at all anal about these types of things. LOL. Rating: 5