don't cut the fans you will be better off cutting the branches that are not exposed,. In fact this is called trimming for yeild, Fan leaves create the building blocks ( sugars and starches) for large health buds . Definate loss of productivity after removing them ...Pixy duster is absolutly correct, in fact this topic should not even be debated. What those fan leaves do for the plant is not debateable..... So its sort of a no brainer that they should remain I leave them when i cut a clone from the stock . The leaf remains the same, I hired a helper last summer that thought you should remove any yellowing leaf as well, so he went to tearing all the partialy yellow, and bottom fan leaves off, boy what a waste of time that crop was!!!!! lost many ounces because this yahooo.