The perfect thing for harvesting honey supers in warm weather - just spray a bit of Fischer's Bee Quick on the felt side of the board, put it on in place of your cover, and the super will be free of bees in 3-5 minutes.
Crafted by Forest Hill Woodworking in Pennsylvania, these are the best fume boards on the market. Instead of the usual galvanized top, Ike covers these with black aluminum. It absorbs sunlight for much more effective action from the Bee Quick.
(For harvesting supers in the fall when nights are cool, we recommend the use of a triangle escape. Every situation has the right tool for the job.)