215.0 M – — 2025 California Mechanical Code

Machinery. The refrigeration equipment forming a part of the refrigeration system, including, but not limited to, the following: compressors, condensers, liquid receivers, evaporators, and connecting piping.

Machinery Room. [SFM] Machinery Room is a room in which a refrigeration system is permanently installed and operated but not including evaporators located in a cold stor- age room, refrigerator box, air-cooled space or other enclosed space. Closets solely contained within, and opening only into, a room shall not be considered machinery rooms, but shall be considered a part of the machinery rooms in which they are contained or open into. It is not the intent of this definition to cause the space in which unit or self-con- tained systems of Group I refrigerants are locate to be clas- sified as machinery rooms.

Mechanical System. A set of components, devices, appliances, and equipment intended to perform a function(s) for which the system is designed, as regulated by this code.

Mechanical Ventilation. Ventilation provided by mechanically powered equipment, such as motor-driven fans and blowers, but not by devices such as wind-driven turbine ventilators and mechanically operated windows. [ASHRAE 62.1:3]

Mid-Story Guide. A support designed to keep piping in alignment, located mid-way between floors or a floor and ceiling.