Which specification stipulates the normally open and normally closed logo of fire dampers?

Basic identification colors, symbols and safety signs of industrial pipelines. The identification basis of normally open and normally closed fire dampers is GB 7231-2003, which is the basic identification color, identification symbol and safety identification of industrial pipelines. There are also certain requirements for the normally open valve of the fire pump room in the safety code, including the installation position, handle height and identification of the normally open valve.