- FSR will introduce ceiling boxes designed to conceal equipment above the tiles and blend with existing décor. The only ceiling boxes in the industry with both agency and plenum ratings, the units are available in two sizes and six varieties with numerous options to accommodate a variety of audio/video applications including classrooms, conference and meeting rooms. A white rim style door that is inserted into any ceiling tile is included on all boxes as standard. Designed for classrooms, FSR’s CB-12 provides an external AC receptacle facing the room in a 2x1 foot enclosure fitted into the ceiling surface. The box features four (two duplex) additional un-switched AC receptacles inside the enclosure, two shelves to mount two half-rack control or AV equipment, and knockouts to allow wiring. A fan kit and a variety of mounting kits are available as options.