machine room

machine room (plural machine rooms)

1. A limited-access room in a larger building dedicated to HVAC equipment and other machinery.
2. A dedicated room for computers and related data processing equipment, often having a raised floor, abundant and dedicated air conditioning, and specialized power supply and fire suppression systems.
3. A room for other types of machinery.
   • 1960 June, “New Lifting Bridge at Kings Ferry”, in Railway Magazine, page 388:

     The two machine rooms, one each side of the river, are housed below road level. […] There is a synchronous tie between the motors in each machine room to ensure that the span remains level during raising and lowering.

• (room housing HVAC and other equipment) plant room
• (room housing computer equipment) data center

• boiler room
• engine room

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