There is an industry-wide push right now to use fan arrays based on efficiency, redundancy, and fit. Not too long ago, the only fans in use in air handlers were double-width, double-inlet (DWDI) fans. In recent years, engineers and facility personnel have begun to understand how plenum fans, if applied correctly, could provide a larger set of solutions for a specific job. Fan array systems can offer a simpler maintenance process, lower noise output, and a smaller environmental footprint than traditional air handling units. In addition, fan array systems can make facility personnel’s jobs easier.