Raised Access Floor

A raised access floor (RAF) is a structural floor system installed above the structural slab, creating a void — the plenum — that carries electrical cables, data cabling, HVAC supply air, and sometimes chilled water pipework. Individual floor panels can be lifted for easy access to services, making reconfigurations far cheaper than cutting trenches in a solid slab.

In Indian Grade A office buildings, raised access floors with 150–400 mm void depth are standard. The plenum allows under-floor air distribution (UFAD), where conditioned air is supplied at low velocity through floor swirl diffusers. The void depth determines how many services can be accommodated: a 150 mm void handles cabling only; 300 mm or above allows full HVAC integration. RAF void depth is one of the first things to verify in a building survey.

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