Although the number of applications for underfloor-air-distribution (UFAD) systems has increased over the years, the basic design concept for UFAD has not changed. UFAD systems utilize the space under an access floor as a supply-air plenum, taking advantage of thermal stratification to reduce energy use. The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) recommends that an occupied zone have a temperature of 73 to 77°F, a relative humidity of 25 to 60 ...

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