Kitchen ventilation is a complex application of HVAC systems . The design of kitchen ventilation system includes aspects of air conditioning, fire safety, ventilation, air distribution, food service equipment and systems commissioning. The centerpiece of almost any kitchen ventilation system is an exhaust hood, which is used primarily to remove effluent from kitchens. Effluent includes the gaseous, liquid and solid contaminants produced by the cooking process. Balancing brings the many ventilation components together in a way that provides the most comfortable, efficient and economical performance of each component and of the entire system.