Plenum Rating and Yaskawa AC Drives

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.