| http://www.w3.org/ns/prov#value | - A raceway marked Plenum is suitable for use in ducts, plenums or other spaces used for environmental air when used to enclose optical fiber cables marked OFNP or communications cable marked CMP or CMP-OF. This raceway exhibits a maximum peak optical density of 0.5, a maximum average optical density of 0.15, and a maximum flame spread distance of 5 feet when tested in accordance with the Test for
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