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Plen-Flex® is constructed from a steel strip which contains an extra coating of zinc galvanizing for added protection against corrosion. This strip is formed into a corrugated profile and is tightly interlocked to form a smoketight, airtight, and liquidtight pliable tube, which weighs about 40% less than FMC (Greenfield).
There is also no plastic jacketing material, which might give off toxic gases or burn. The fact that the system is liquidtight means that it will not allow the entrance of moisture from sprinkler systems into its interior. It is intended to be installed in accordance with Article 360 of the NEC® (ANSI/NFPA-70).
Listed - File #E80694, Approved for use by the city of Chicago.
® Electri-Flex Company 1-800-323-6174, http://www.electriflex.com/
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