A plenum is a chamber or space in an HVAC system that distributes heated or cooled air throughout a building. It is typically connected to the supply outlet and feeds ductwork that carries air to individual rooms. Keeping the plenum and ducts clean and sealed helps maintain efficient airflow and indoor comfort.
/ˈpliːnəm/
A plenum is a chamber or space in an HVAC system that distributes heated or cooled air throughout a building. It is typically connected to the supply outlet and feeds ductwork that carries air to individual rooms. Keeping the plenum and ducts clean and sealed helps maintain efficient airflow and indoor comfort.
What does a plenum do in HVAC?
It collects and distributes conditioned air into ductwork for delivery to rooms.
Source: The Cooling Company
Conditioned air enters the plenum before flowing into ducts.
In office buildings, conditioned air flows into a plenum and then through ducts to reach each room.
Check the plenum for leaks or damage, as air loss can reduce system efficiency.
“Check the plenum for leaks or damage, as air loss can reduce system efficiency.”
The term plenum comes from Latin for "full," describing a space full of air.
Where is the plenum located?
It is typically attached to the HVAC supply outlet and connects to duct branches.
Can a leaky plenum raise energy bills?
Yes. Leaks reduce delivered airflow and force the system to run longer.
Should I clean the plenum?
Yes. Cleaning supports airflow and indoor air quality.
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