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I think it helps keep the meat a little more moist personally. In my smoker, I have a homemade damper between the Fire Box and Cooking chamber to make the hole smaller and help redirect the heat. I put the water pan directly on top of that which has helped level off the temperature between the 2 sides of the Cooking Chamber. It is one of those things that you will have to test and see what works best for you and your smoker.