A modular fan array is provided that is configured for use in an air-handling system and configured to deliver air to a ventilation system for at least a portion of a building. The modular fan array comprises a plurality of modular units configured to be stacked adjacent to one another in at least one row or column to form an array. The modular units each include at least an interior surface, a front end and a back end that define a chamber. The modular fan array includes motors and fans positioned in the chambers of the modular units. The fans are located proximate to the front ends of the corresponding chambers. The fans direct air to discharge from the back ends of the chambers. Sound attenuation layers extend along at least a portion of the interior surface of the chambers. The sound attenuation layers are positioned between at least some of the adjacent chambers.