Usually work status exhaust ventilation and two-speed accident repair exhaust fan for the high-level basement, two-speed asynchronous motor is particularly suitable. Two-speed fan running at high speed into a low-speed exhaust fan Changzhou, synchronous speed improve a lot, the exhaust volume greatly improved accordingly, then the system immediately replaced by exhaust smoke condition. But in the design process oblique flow exhaust fan, will encounter two-speed electric fan control problems, that is how to solve the motor windings from Δ connection Y connection to the double conversion and interlock, automatic fire linkage and manual control; blower protection shutdown at high speed and reliability in the smoke of how to maximize the protection of the accident, how to ensure the power supply and other issues. The centrifugal fan is to rely on mechanical energy input, increase gas pressure gas side mechanical transmission, it is a slave fluid machine. Centrifugal fans are widely used in factories, ventilating mines, tunnels, cooling towers, vehicles, ships and buildings, dust emission and cooling; boiler and industrial furnace ventilation and the wind; air-conditioning equipment and household appliances and cooling equipment ventilation; grain drying and sending; wind tunnel source and inflatable hovercraft and propulsion. Handan exhaust fan, Hao Yang air conditioning equipment (certified), exhaust fan provided by the Texas Air Conditioning Equipment Co., Ltd. Hao Yang. Air Conditioning Equipment Co., Texas Hao Yang (www.dzapjt.com) is a leader in Dezhou, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Hao Yang air conditioning equipment in leadership with the staff warmly welcome all inquiries negotiations to create Hao Yang air conditioning equipment a better future.