What is the minimum height requirement for acceptable air flow performance of UFAD systems?
Underfloor plenums serving UFAD systems are flexible in terms of accommodating components from other distribution systems. Experiments have been carried out by CBE, in a 300 m2 (3,200 ft2) underfloor zone, into the variables that affect performance of UFAD systems. These have shown that pressurized plenums with at least 75 mm (3 in.) of clear space for air flow, in addition to the space required for other elements such as cable runs, are capable of maintaining a uniform distribution of airflow to diffusers. In situations where obstructions leave as little as 38 mm (1.5 in.) clear space above them, the risk of disrupting airflow is minimal providing the overall plenum height is at least 205 mm (8 in.).
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