The design of a cleanroom is an essential part of the contamination control programme and there are many aspects that need to be considered. Simply focusing on one factor, like air change rates, is insufficient.
Central to design is understanding the ventilation pattern, which is concerned with the movement and distribution of the air within an enclosed space (the cleanroom). The air movement within an enclosed space can be very complex as it depends on many factors, including room geometry and the size and shape of equipment. Furthermore, the type and positioning of air inlets and outlets is important.