Fume Board: Apply lightly to the felt side of the fume board, paying close attention to the edges where bees congregate. Smoke the bees slightly, remove the inner and outer covers then place the fume board on the hive felt side down and rotate so the corners of the hive are exposed, letting air flow through. Bees should be removed within 5 – 10 minutes. If bees are seen coming out of the entrance in large numbers, you have applied too much. Remove the board and let some of the product evaporate off before reapplying.