Underfloor-air-distribution (UFAD) systems have been used for comfort conditioning in U.S. office buildings since the early 1990s. With a UFAD system, air is delivered to occupied spaces through floor-mounted outlets supplied by a pressurized plenum beneath a suspended floor. A properly designed UFAD system takes advantage of thermal stratification. The key is to have a diffuser that rapidly mixes air before it penetrates the stratification layer at the upper end of the occupied zone. The ...

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