ceiling plenum

ceiling plenum

In an air-conditioning system, the space between a hung ceiling and the underside of a floor slab above, where this space is used as a plenum for return air.
References in periodicals archive ?
Estimated uncertainties in the conditioned space, the ceiling plenum, and the convective fractions are relatively high.
On the other hand, the office utilizes natural ventilation indirectly by releasing fresh air introduced from above the window sash into the ceiling plenum and mixing it with return air to the air-handling units (AHUs) in the plenum to reduce the variations in thermal environment due to natural ventilation.
Features include a contemporary dash with lower-profile instrument panel, leather furniture, 84" ceiling heights, and decorative living room/galley ceiling plenum with accent lighting.
The scope of the construction will include demolition of the existing ceiling and lighting as well as most of the ductwork and systems in the existing ceiling plenum.
The onboard filtration system comprising of a minimum of fine dust filters and HEPA filters removes the dust before returning clean air into the ceiling plenum.
In this test, referred to as a grid map test, tracer gas was released in one test zone, as in previous tests, but tracer gas samples were taken from approximately 100 locations in the nearby ceiling plenum that are potential locations of an FPB.
The speed is varied so that they pull out exactly the correct amount of air from the enclosure and send it back to the air conditioner return via a ceiling plenum.
It is important to investigate the entire air delivery system -- look with fluoroscopes at the ventilation system from a hygienic standpoint, such as the ceiling plenum and interstitial spaces.
The Vertical Exhaust Duct, a CPI Passive Cooling[R] Solution, used with the F-Series TeraFrame[TM] Cabinet System isolates and guides hot exhaust air from the back of the cabinet to the drop ceiling plenum, creating a closed hot air return path to the cooling system.
UpClassN and LowClassN were considered especially important because the inlet from the return plenum to the AHUs was located in the ceiling plenum of these rooms.
The ceiling plenum fraction can then simply be determined as one minus the conditioned space fraction.