HELP: Is the ceiling an air return or duct?

Almost all cabling/wiring comes in either of two jackets. A jacket is the outer sheath that protects the copper or fiber from damage. The two types:

• Plenum: Required by some municipalities; regardless of ceiling type. In this case, your ceiling forms a giant duct for heating or cooling your air.

• Non-Plenum (PVC): Your ceiling does not form a giant air return and plenum rated wire is not required by your local municipality.

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