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Reference.org
Plenum chamber
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<p>A plenum chamber is a pressurised housing containing a <a href="/facts/Fluid/tMQ46Tmz">fluid</a> (typically air) at <a href="/facts/Positive_pressure/SUHXtywR">positive pressure</a>. One of its functions is to equalise pressure for more even distribution, compensating for irregular supply or demand. It is typically relatively large in volume and thus has relatively low velocity compared to the system's other components. In wind tunnels, rockets, and many flow applications, it is a chamber upstream on the fluid flow where the fluid initially resides (approximately at rest). It can also work as an acoustic silencer. </p>