Dumb waiters are the small freight elevators which have been used for than a century in homes, castles, and mansions. Dumbwaiters are small elevators (or lift) not intended to carry people or live animals, but objects. Dumbwaiters found within modern structures, including both commercial and private buildings, are often providing solution to connect different floor to transfer the material. When they are located in restaurants or in private homes, the lifts generally find their place in a kitchen. Most dumbwaiter systems are run on the same principal as normal freight elevators do. They do have guiderails on opposite side of walls to support and guide the dumbwaiter to achieve its vertical motion.. The cab in the dumbwaiter should be no more than two feet wide by two feet long. Dimensions can vary for customized dumbwaiters. Electric dumb waiters operate by a series of call buttons to call and send between floors and can support more weight than a manual dumbwaiter is able. At home dumbwaiters typically hold up to 50-100 kg, while commercial dumbwaiters have capacity up to 300-500kg. Although in commercial use the size of dumbwaiter can larger but still use it for human and animal is strictly prohibited. Dumbwaiters can have multiple openings on different floors. This totally depends on the shaft construction.