Selecting Ventilation Fan Capacity for University Classroom Based on Empirical Data.

This paper presents a guideline for selecting ventilation fan based on empirical data. The research project was undertaken in a university classroom of 64 square meters. In a two-hour experiment, carbon dioxide levels exceeded 1600 ppm when not using any ventilation system. Subsequently, the carbon dioxide levels increased approximately at a rate of 11.49 ppm per minute for 15 students sitting in the room. The carbon dioxide levels within the tested classroom exceeded 1000 ppm after the 42^nd minute. When students left the room, CO₂ decreased approximately at a rate of 3.67 ppm per minute. Straight-line functions were used to model the increasing and decreasing behaviour of CO₂ concentration in the classroom. An example of how to select an appropriate ventilation fan capacity is shown as an approximation guideline. [ABSTRACT FROM AUTHOR]