Gray Flex Systems is one of the leading providers of heating, ventilation and air conditioning services in the United States. Gray Flex offers a complete line of insulated and specialty flexible duct and air distribution products. The company also offers grade raw materials, state-of-the-art automation techniques, zero tolerance precision controls, customized ductwork, and prefabricated metal duct and fittings. It manufactures various types of duct-related products, such as metalized and gray polyester, black polyethylene, foil and polyester connector, and mobile home tools. Additionally, it provides a wide variety of services, such as heating, cooling, and indoor air quality sales and installations, maintenance and repair services, indoor comfort solutions, precision tune-up solutions, thermostat calibration, burner assembly procedures, corrosion inspections, and safety control testing.