Janssens Royal Victorian Greenhouse Drop Door Kit The drop door kit allows the standard Janssens Royal Victorian greenhouse to be placed on top of the perimeter wall. If you are trying to place a Janssens Royal Victorian greenhouse on a stem wall, the drop door kit becomes essential. It increases the height of the greenhouse between 20"-36 inches (24" might best). N.B: This kit does not include the new glass panels needed above the doors, those should be ordered locally. However, we might...