Cleanroom is an environment, typically used in manufacturing or scientific research that has a low level of environmental pollutants such as dust, airborne microbes and chemical vapours.

Clean rooms are unique in their construction, having virtually every component built in during production to suit all applications and to meet industrial requirements.

HVAC usually refers to the mechanical system of the building that provides heating, ventilation and/or cooling within a building or a premise. This includes Air conditioners.