By Robert Trotter, CBO, CFM (in Engineered Systems July 1, 2011)
Incorporating a plenum can have its design advantages, but corridors serving adjoining areas of health care occupancies are prohibited from being used for a portion of an air supply, air return, or exhaust air plenum. This article and its illustrations can strengthen your grasp of the related NFPA code details and exceptions so you can design and ventilate properly for this special population.
In the built environment, a plenum is a separate space specifically for air circulation for HVAC, typically provided in the space between the structural floor/ceiling and a suspended-grid acoustical tile ceiling. When making design decisions, you should consider the advantages and disadvantages of plenum configurations.
Read entire article here: Plenum Requirements for Egress Corridors in Health Care Environments
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