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Open Access Publications from the University of California

Design guidelines for underfloor air supply plenums


The use of an underfloor plenum to deliver conditioned air directly into an occupied zone of a building is a key feature distinguishing underfloor-air-distribution (UFAD) systems from conventional ducted overhead systems. Current research ( and design practices are focusing on two plenum-related topics that can have significant impacts on the successful operation of UFAD systems:

- Air leakage from pressurized plenums.

- Underfloor-plenum-supply-air heat gain (thermal decay)

This article will present updated design and operating guidelines addressing both of these topics.

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