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Definition of "Plenum, Plenum-Rated" |
Plenum refers to an air chamber in a heating, ventilation, and air conditioning (HVAC) system or to the space between a dropped ceiling and the floor above. In many buildings, the plenum space is often used to route conductors and cables. Plenum-rated describes a special type of conductor or cable which is approved/rated for use in a building plenum space. These types of conductors are specially insulated, giving them low flame- and smoke-producing properties. Non-plenum rated cables may also be routed in a plenum space, if they are enclosed in conduit that provides fire-resistant properties. |
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