How to use your corflute slider
The corflute slider, when placed in the top slot, is used to stop all ventilation through the mesh at the bottom of the hive, excluding the entrance. Bees will more likely stay in a box when first installed if there are no draughts from places they cannot seal up.
Once the colony is established you can increase the ventilation at the base by putting the corflute slider in the bottom slot.
The corflute slider has many potential purposes – pulling it out and observing what detritus is falling through the mesh floor gives a beekeeper an indication of the health of the hive and the degree to which pests like wax-moth, and small hive beetles are present. It can also be used as an indication of the degree of varroa infestation.