National Underfloor Entrance - Bottom Bee Space with Varroa Mesh

For National hives using bottom bee space.  This includes many of the bigger manufacturers, if the tops of your frames sit level with the top edges of your boxes, you're on bottom bee space.  This version has a full size varroa mesh and the option to add a varroa inspection board.  We don't use the boards here, we check our varroa loads with an alcohol wash so we thought that we'd offer a slightly lower cost option to not include a board.  The board is made from a thick correx sheet and should only be inserted when actively checking varroa counts.