Plenum chamber
![Schoolroom ventilation on the plenum system](/Images/godic/202502/03/N&AMOV_-_School_-_clean2354.png")
![V12 engine (non-supercharged), showing plenum chamber](/Images/godic/202502/03/2001_Ferrari_550_engine2354.jpg")
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![Hovercraft schematic](/Images/godic/202502/03/Hovercraft_-_scheme.svg2354.png")
A plenum chamber is a pressurised housing containing a gas or fluid (typically air) at positive pressure (pressure higher than surroundings). One function of the plenum is to equalise pressure for more even distribution, because of irregular supply or demand. A plenum chamber can also work as an acoustic silencer device.