How after ko-ngai epead into the furnance?

It seems like there might be a typo or misunderstanding in your question. If you are asking about how something is processed or transformed in a furnace, typically, materials like metal or ore are heated to high temperatures to facilitate melting or chemical reactions. This process can involve various stages, including loading the furnace, maintaining specific temperatures, and ensuring proper airflow. If you meant something different, please clarify, and I'd be happy to help!