Since the number of students in each department and class varies, it is efficient to use space separation.
Classes with large number of students can fold the folding door for a wide range of practical classes, and class with small number of students can fold the folding door for a suitable space for practical classes.

It is useful to open and close on both sides (two ways), rather than open and close on one side (one way), because it is easy to open and open, construction is done on both sides, and one system door is installed so that even if the folding door is closed, access to the class is not interrupted.