A cooking hood is also known as an exhaust hood. It is an equipment consisting of a mechanical fan which hangs above the cooktop or stove in the kitchen. A cooking hood removes airborne oils, grease, fumes, smoke, combustion products, odors, steam, and heat from the air by evacuation of the air and filtration. Cooking hoods are also used in combination with various fire suppression equipment such as fire sprinkler systems and wet and dry chemical agents. These devices vent out fumes from grease fires to rapidly put out fires. Commercial cooking hoods can be used in combination with fresh air fans. The air fan draws in exterior air, circulating it with cooking fumes, which is then drawn out by the cooking hood. In most exhaust hoods, a filtration system eliminates grease and other particles from the kitchen. Cooking hoods vent out the air from the kitchen to the outside atmosphere, however some of the cooking hoods recirculate the air in th...