 Put simply, with the sliders inserted in the central portion of the box at the top of the brood nest, thus inhibiting the queen from laying above,the withdrawal of the sliders to the sides allows workers to begin drawing comb and storing honey at the sides of the honey box above.As the nectar flow proceeds, and more honey is stored this comb is built from both sides towards the centre.The beekeeper can establish whether the bees require more space by opening the windows.