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- The void between the raised floor and the ground is flooded with cold air from the CRAC.
- The positive pressure in the floor allows the cold air to filter into the contained aisle through vented floor tiles.
- This cold air is then pulled through the equipment inside the rack.
- The air is now warmer due to the heat generated by the equipment. The hot air is channeled upward in the plenum door by twelve fans.
- The hot air continues upward, through the chimney, until it is exhausted into the ceiling void.
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