Definitions for "Raised floor"
The machine room (also known as the Glasshouse). So named for the fact that you are walk on tiles that can be removed to gain access to the cabling that runs below your feet. The area below your feet is also the air conditioning duct to simplify cooling of all the hardware in the room. The irony of it all is that most raised floor machine rooms these days are built for ISP and corporate LAN servers, run by the same people who decried them during the PC Revolution.
a must to keep your dog dry and warm and proper ventilation will provide fresh, comfortable air while maintaining temperature
Used in telecommunications and computer rooms to run connecting cables and air ducts to cool equipment.