Though suspended ceilings (above, right) remain the most popular ceiling system option, facility managers report that 17% of their total building square footage still features an open plenum ...

While suspended, lay-in ceilings have long been the norm in commercial design, the open-plenum ceiling has become trendy and economical, particularly in office and retail environments. However, ...

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A UL-approved fiberglass plenum box with ceiling radiation damper (CRD) is available in three model styles. The fiberglass plenum boxes are offered in 1- and 1-1/2-inches-thick rigid ductboard with ...

Open ceilings offer an opportunity for creative design and technical integration. They play a key role in forming interior spaces and add value by adding comfort through acoustics, finishes and other ...

All questions and answers are based on the 2011 NEC. Q. What wiring methods are allowed by the Code in spaces above a lay-in ceiling? A. Section 300.22(C) applies to spaces used for air-handling ...