A cleanroom is a controlled environment with a specialised design for controlling variables such as the density of airborne particles per cubic metre or the temperature of the room. Cleanrooms are essential for manufacturing processes which require high degrees of cleanliness or a precise temperature, such as in the computing industry. They are used most often during the creation of microchips and pharmaceuticals but are also used widely in a variety of other industries. However often the environment. and the PPE worn. is to protect the product only and not the user – a popular misconception.