Manhole is offered square type as standard but optionally can be manufactured bigger like, drive through door when a larger opening is required or where a skid-steer loader will be used for final cleanout. Manhole is located on second bottom ring for entering silo when silo is empty. By the help of inner cover of manhole; opening of the door is prevented when silo is loaded and safe usage is provided. All necessary calculations made against grain pressure and manhole is designed very robust with it’s special fortified frame. Insulation is also provided with special parts. There is asmall lid on the inner cover of the manhole for specimen. Galvanized steel step providing step up to walk-in doors or other hard to reach areas.