More and more beekeepers are convinced that the use of this type of floor is beneficial to the colony. Made from top-quality Canadian western red cedar (22x 63mm frame) with a galvanised expanded mesh screen. Advantages: Improved wintering - water vapour escapes easily through the floor - no need for top ventilation which wastes the colony's heat. No need for extra screens when moving bees. Reduction of varroa populations - mites which fall through the screen do not climb back up. Distance below mesh is 40mm. Easy monitoring of mite populations - simply slide in the plastic drawer under the screen when required. Can be left on all year round. National size only.