Sonata Box Type Sound attenuators for Tunnel vent systems and Plant are commonly designed for durability and longitivity that is common with operating conditions. Either Splitter Modules or complete attenuator assemblies can be used in these instances with emphasis on design for noise reduction. Ventilation shafts exhausting air drawn in via axial fans through the entry portals commonly have Sound Attenuators installed. Plant Rooms and similar are traditionally limited on space and Sound Controls experience and capabilities can assist in achieving the desired result within these areas.