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 ?
We have gone so far as to show electrical conduit running within the flutes of the roof deck steel due to severe "congestion" in the ceiling plenum.
It can be constructed as a hot aisle containment module when a ceiling return plenum is present, or it can be configured as a cold aisle if cooling is done through a raised floor, there is limited ceiling height, or when there is no ceiling plenum available.
HoBo data loggers were used to trend real-time (every 5 minutes) dry-bulb temperature and relative humidity at selected locations in two case-study offices (Office #1 and Office #2): within UFAD terminal boxes' diffusers, 1' (0.30 m), 3' (0.91 m), 4' (1.22 m), 6' (1.83 m), 7' (2.13 m), 8' (2.44 m), 9' (2.74 m), 10' (3.05 m), and 11' (3.35 m) above the floor, and in the return air plenum (ceiling plenum).
'The worst case scenario is that they'll get up into the ceiling plenum and spot some asbestos," Vogel says.
Concentration measurements were made in the breathing zone (a location four feet [1.2 m] above the floor near the center of the room) in the return grille, which should be similar to the breathing zone if the room is well-mixed, and in the secondary air inlet, where the FPB draws air from the ceiling plenum.
The local unit may be installed in a ceiling plenum, closet or roof.
Double ceiling allows energy-efficient recirculation to ceiling plenum. Dehumidification modules available.
Service loops are located within the ceiling plenum of the labs with vertical services chases on a module aligned with the column grid to maximize clear lines of sight in the open lab area.
For the office area structured as a unit with two stories, and for the office garden located at its center, natural ventilation openings are installed: (1) above the window sash in ceiling plenum, (2) within the upper-layer and lower-layer elevator halls (in the electric and piping shafts [EPSs]), (3) on the office garden floor, and (4) on the office garden ceiling (Figure 2).