What is the length and width of the classroom blackboard?

It is 4m long and 1 m wide. Blackboard size: the height should not be less than 1000mm and the width should not be less than 3600 mm. So the blackboard in primary school is 4 meters long and 1 meter wide. Blackboard is one of the necessary teaching tools in class. Common types of teaching blackboards include traditional blackboards, color-coated steel blackboards, new material composite blackboards, movable blackboards, magnetic blackboards, interactive electronic whiteboards, glass blackboards and so on.