the floor of a building where service equipment, utility lines, and various machinery are located. A service floor can be located in the basement, on the top floor, or in the middle portion of a building. Some buildings have several such floors. Service floors contain heating, water, and sewage pipes, air ducts, power supply mains and equipment, ventilating and air-conditioning equipment, elevator engine rooms, rooms for various equipment, and supplementary rooms.
Service floors are found in multistory residential and public buildings and in plants of the electronics, radio engineering, and other industries, which have much technical equipment and require the careful regulation of the temperature, humidity, and air circulation in production areas.