By the name itself, people would have easily guessed that it is a place for people to dine in, enjoy foods that are offered in the place but to be more specific, restaurants is an establishment where diners are served food at their seats, by a food service provider known as waiter and waitress. However, as the world becomes more efficient and modern, fast food restaurants are also known as a restaurant even though it is a self-service restaurant. Referring to an establishment calls a restaurant, it has its manpower, place to occupy numbers of visitors, kitchen to cook, and the use of an HVAC system to supply air for indoor space.