The broad face of the building faces windward which makes it easy to harness the wind. The air comes from the outside of the building through the floor and moves up into the living space through vents. This system of ventilation is called stack venting and it works due to the fact that Guanghou has a lot of winds which makes the stack effect possible and feasible.
The air coming through the slabs of the building is brought to the north face and is then taken out of the building by using the stack effect.
Image Source: http://www.josre.org/wp-content/uploads/2012/09/Pearl-River-Case-Study-China.pdf
As seen in the image above the wind going over the building sucks the air below to the top through stratification. The air that comes into the tower circulates the building and goes out of it which prevents a reuse of the same air. This air usage strategy prevents or reduces the transfer of diseases because air is not used multiple times.
Image Source: http://www.josre.org/wp-content/uploads/2012/09/Pearl-River-Case-Study-China.pdf