Model DGXs modular design provides the most configuration flexibility and expanded heating and airflor capacities. In addition to 100% outdoor air operation, recirculation and variable volume airflow options are available. Airflow volumes range from 800 to 48,000 cfm with heating capacities up to 4,800,000 BTU/hr. Cooling option: Evaporative cooling up to 46,000 cfm. Chilled water or DX cooling up to 11,000 cfm