Which specification stipulates that the winter solstice sunshine of ordinary classrooms in primary and secondary schools should not be less than 2 hours?

Code for architectural design of primary and secondary schools

Article 4.3.3 stipulates that the sunshine of ordinary classrooms in winter solstice should not be less than 2 hours.

Interpretation of Article 4.3.3

Sunshine is the basic condition for the healthy development of students, and the length of sunshine is directly related to the healthy growth of students. The special scientific research achievements of the Ministry of Health in China point out that the human body can only synthesize vitamin D through a certain period of sunshine every day, and sunshine plays an important role in inhibiting the invasion of cancer cells and the growth of the body. Direct sunlight can also inhibit and kill some germs that are prone to infectious diseases at school. See Table 2 for the killing effect of sunshine time on bacteria.

Direct sunlight plays an important role in protecting students' health. 50% of primary school students take classes in ordinary classrooms, and 465,438+0% of middle school students take classes in ordinary classrooms. Therefore, this specification stipulates the sunshine time of ordinary classrooms from winter solstice to Sunday. The laws and regulations of the Netherlands, Switzerland, Japan, Russia and other countries also stipulate the sunshine time of school construction.