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Plenum
The plenum, the area above the luminous ceiling, forms the reflecting cavity for the luminous ceiling. The ideal plenum is completely enclosed and sealed to prevent light loss at the perimeter and keep the luminous elements clean, is unobstructed to prevent light loss from beams, ducts etc., and is finished matte white to maximize light efficiency.
Plenum Access
The entire luminous ceiling plenum is easily accessible by lifting out the individual luminous elements.
Plenum Privacy
For privacy, partitions should extend through the luminous ceiling to the structural ceiling.
Beams, Ducts, Joists ETC.
Plenum obstructions may require an increase in the lamp requirement of 10 Ð 25%. To avoid shadows from obstructions, the fixture should be placed at right angles and run under them if the cavity depth allows. When the cavity depth prevents this, the lamp spacing should be reduced next to these obstructions to help wash out the shadow. All obstructions should be painted matte white.
Reflectors
When plenum conditions are not favorable to good light reflection, we recommend fixtures with reflectors be used to direct the light downward.
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Lamp Spacing
To avoid bright streaks of light on the luminous ceiling, it is important that the spacing ratios below be followed; the ratios of the maximum spacing between lamps (A) vs. lamp to luminous ceiling distance (B) for some common luminous elements are given below. Dimension "C" should be approximately 1/2 of dimension "A".
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A - B
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White Plastic Louvers
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1.50 - 1
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White Metal Louvers
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1.10 - 1
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Specular Parabolic Louvers
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1.25 - 1
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Colored Plastic or Metal Louvers
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1.00 - 1
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White Diffusers Flat and Formed
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1.50 - 1
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Clear Prismatic Lens
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1.00 - 1
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White Quad Designs
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1.00 - 1
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Colored Quad Designs/
Wood Designs
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0.75 - 1
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Note:
Based on white unobstructed cabity with a depth of 14" or greater.
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Integrated Plenum System
No. A.C.S.
No. A.C.S. acoustical sub-ceiling system increases the lighting efficiency, provides a return air space, adds a sound absorbing surface, and reduces the cubic feet of space requiring air conditioning.
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A - Structural ceiling
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B - Utilities cavity
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C - No. A.C.S sub-support system provides light reflecting and sound absorbing surfaces and "rapid mount" grid framework.
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D - Light fixtures clipped to grid framework with "rapid mount" clip no. ZC.
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E - Luminous ceiling suspended from "rapid mount" grid framework by no. N-100-GRM adjustable rod hangers
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Air Handling Equipment
Air can be introduced or removed from the space by a wide variety of equipment integrated into the overall ceiling design. These include linear air bars, lay-in square anemostats, etc. A service panel of acoustical or other material can be incorporated into the luminous ceiling design or around the perimeter to accommodate these systems. Communication and sprinkler systems can also be introduced either above an open louver or into a service panel.
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