Above Ceiling Plenum Box

However some drop ceiling designs create a.

Above ceiling plenum box.

They offer localized mounting for a v and technology equipment in a plenum approved enclosure. Not all above ceiling spaces are considered a plenum. The receptacle should not be permitted in this location. A plenum is any space duct or above ceiling or in a stud space that is used to convey environmental air air that you and i will breathe in our environment other than the actual room area.

If the space above the drop ceiling is used for environmental air transfer meaning the air above the drop is apart of the air return then it is a plenum area and plenum rated cables shall be installed. 2 x 2 above suspended ceiling storage box. A plenum space is a part of a building that can facilitate air circulation for heating and air conditioning systems by providing pathways for either heated conditioned or return airflows usually at greater than atmospheric pressure. These boxes are available with and without an option for mounting a projector.

If the return air for the above ceiling hvac unit is not ducted directly to the grid ceiling and it is pulled through a ceiling register with no duct work then the space is being used as a plenum or for environmental air. You cannot put any combustible materials in these spaces unless they are listed for the application. For a new way to hide clutter look up to the new evolution series ceiling boxes. View from below the acoustical ceiling with some ceiling panels removed to show the plenum barriers above partitions that terminate at ceiling height.

The way i interpret that is while the plenum edge can have exposed wood wood framing can t extend into the plenum such as a partition wall extending above the ceiling to the lid with the drywall stopping just above the ceiling. In these areas metal wiring methods are required per nec 300 22 c. The plenum barriers block noise that would otherwise transmit through the ceiling and over the top of partition.