Ventilation, air conditioning and the indoor air environment.

This paper presents a Chinese approach to ventilation and air conditioning, which are important measures needed to improve the indoor air environment of a building. They are important because improper design of a system may degrade the indoor air environment rather than enhance it. This is a situation that might be called sick air conditioning. Also, in circumstances where the outside air is heavily polluted air treatment is necessary to avoid worsening the indoor environment.