Fits between the brood chamber and super with its four sided frames. The pollen trap sits on the outside of the hive boxes. Once the old entrance is blocked off, the bees will enter through the pollen trap entrance and go through a screen, knocking the pollen off and into the pollen trap drawer. The drawer opens easily to harvest your pollen. Close off for 3 - 4 days every week to allow the bees sufficient stores.