1. The choice of the control parameters for wind chassis air flow, total pressure, efficiency, noise, and electrical power. There are centrifugal and axial flow. 2. The fan since the wind chassis, muffler favor. 3. When the fan selection should consider piping system leakage losses, calculation errors. DBF series of low-noise wind chassis, is designed to meet the air supply and exhaust equipment required to run different operating conditions, according to the needs of the wind turbine. And at the same air in the pipes in different directions. Fans can use the external rotor motor or E-type belt drive. Smooth running, low noise, small size, light weight, appearance, and easy maintenance. It can be widely used in industrial production, civil, commercial entertainment, culture, education and health sectors of the air conditioning works supply and exhaust systems, can also be used for general supply and exhaust. DBF-I type A single fan type, B-type double fan the fire cabinet wind chassis manufacturers, C-style for three fan. DBF-Ⅱ type of forward Sirocco wind chassis htf Francis wind chassis manufacturers, single fire exhaust fan belt drive chassis price of wind, air volume. DBF-Ⅲ type to the plate after centrifugal wind chassis, single fan belt drive, high wind pressure. Junior high efficiency exhaust chassis manufacturers, Echo exhaust wind chassis manufacturers (certified), wind chassis provided by Echo Air Conditioning Equipment Co., Texas. Echo Air Conditioning Equipment Co., Texas (www.dzaike.cn) is Dezhou, central air conditioning leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Echo conditioning in leadership with the staff warmly welcome all inquiries negotiations to create a better future for Echo conditioning.