Fume Boards are used during honey harvest by removing the honey bees from the super you are harvesting.

To use spray a bee removing agent (such as Bee Quick or Honey B Gone) on the felt of the underside of fume board. Lay in the sun to heat the board. The bee removing spray agent is heat activated. After the fume board is heated, remove the cover from the bee hive/super you are wanting to remove the bees from. Place the heated fume board on top of the super. Leave for approximately 10 minutes (or the amount of time specified on the instructions of the spray agent you are using). After the desire time, remove the entire super. 90+% of the honey bees should have left the super.