AAON air handling units are engineered for performance, flexibility, and serviceability. Double wall rigid polyurethane foam insulated cabinet construction and direct drive backward curved plenum fans allow units to have quiet, energy efficient airflow with high static pressure capabilities. The air handling units can be matched with AAON condensing units or an AAON chiller for a complete system.Marine Grade Air Handling Units (AHU) Maintain connectivity in extreme marine conditions. DRS is a leading designer and manufacturer of marine grade AHUs. These AHUs are specifically designed for the marine environment and have a proven track record of performance. All DRS marine grade AHUs utilize quality water and steam coils featuring continuous plate fins and a staggered tube arrangement to provide the best engineering balance between heat transfer, air flow resistance, strength and maintenance. DRS’ marine grade AHUs are designed to comply with American Bureau of Shipping and United States Coast Guard regulations.