If it is ductile cast, you can not break it with a hammer. You can use a torch though. If it is pure cast, you can break it with a sledge hammer. Once you break a hole in it, the rest will break much easier. The other option is to use a thermal or oxy lance, but you better know what you are doing. I would not use one in a house. Goggle it and you will see why. The other option is to use a quickie saw. Good luck.
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