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Plenum Rating and Yaskawa AC Drives

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This document explains what a plenum and plenum rating are in HVAC systems, detailing the UL safety requirements for plenum-rated drives regarding flame spread and smoke generation. It confirms that many Yaskawa AC drives with NEMA Type 1 or better enclosures are plenum rated for Pollution Degree 1 and 2 environments, and provides installation guidelines and a list of compliant drive models.

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