A plenum space is the area in a building used to circulate air for HVAC systems, typically between a structural ceiling and a drop ceiling or under a raised floor. It often serves as a return air pathway without ductwork. Because air moves through this space, materials must meet fire and smoke safety standards to protect indoor air quality.
/ˈpliːnəm speɪs/
A plenum space is the area in a building used to circulate air for HVAC systems, typically between a structural ceiling and a drop ceiling or under a raised floor. It often serves as a return air pathway without ductwork. Because air moves through this space, materials must meet fire and smoke safety standards to protect indoor air quality.
What is plenum space used for?
It provides a pathway for return air circulation, often without ductwork.
Source: The Cooling Company
Plenum spaces move return air above ceilings or below floors.
Office buildings use plenum spaces for return air and often house cables and wiring for easy access and maintenance.
Inspect plenum spaces regularly to keep airflow clean and identify debris or contamination early.
“Inspect plenum spaces regularly to keep airflow clean and identify debris or contamination early.”
Plenum comes from the Latin word "plenus," meaning "full of air."
Is plenum space the same as ductwork?
No. It is a building cavity used for air return, while ducts are enclosed channels.
Can plenum spaces be used for wiring?
Yes, but cabling must meet plenum-rated fire and smoke standards.
Should plenum spaces be cleaned?
Yes. Cleaning helps prevent dust and contaminants from circulating.
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