Marlo Coil is a subsidiary of Engineered Support Systems. Marlo has been a leading manufacturer of custom engineered coils, refrigeration and air handling systems since 1925. It has a 210,000-square-foot administrative and manufacturing facility located southwest of St. Louis. Its engineering and design expertise are utilized in applications for aerospace, food processing, health care, semiconductors, pharmaceutical industries and military applications. Marlos environmental control expertise complements its sister companies. It also supplies coil and air handling equipment to a number of original equipment manufacturers. In addition, Marlo is the United States Navys largest supplier of heating and cooling marine coils, air handling units, product coolers and refrigeration plants. The Sealift Command, United State Coast Guard and international governments are also users of this equipment.