my 2 cents on the subject..the first 4-6" of the slatted rack is 1 solid plank of wood to reduce the amount of light coming in as a result of the entrance.  because of this, the girls will supposedly do a better job of drawing out foundation in the lower corners of the frames as well as filling up more of the cells with honey, pollen, etc.  therefore, if you believe this, always place the slotted rack on the hive entrance with the solid section FACING THE FRONT.  Also, some beekeeps insist that the bottom board be painted a dark color to again reduce the amount of light coming into the hive.  i really don't know if there's merit to anything i've described here.  i've run hives with and without slotted racks and have not noticed a difference.  therefore, i've eliminated that piece of equipment and the ensuing costs.  after all, it's a nickel and dime business.
 
frank fox  lebanon, tn
 
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