Physical plant or mechanical plant (and where context is given, often just plant) refers to the necessary infrastructure used in support and maintenance of a given facility. The operation of these facilities, or the department of an organization which does so, is called 'plant operations' or 'facility management'. It should not be confused with manufacturing plant.
Plant usually includes air conditioning (both heating and cooling systems) and other mechanical systems. It often also includes the maintenance of other systems, such as plumbing and lighting. The facility itself may be an office building, a school campus, military base, apartment complex, or the like.[1]
