HTF series exhaust fan fire for high-rise buildings, underground buildings and tunnels, drying room and other high-temperature exhaust or ventilation. Continuous operation at 280 ℃ under the high temperature exhaust fan uses more than 30 minutes, the medium temperature at 100 ℃ continuous operation 20 hours / times without damaging the exhaust fan, fire is the ideal necessary facilities. 1, the performance of the fan performance table lists the properties in the most efficient range, according to the performance of the air volume is divided into five working points, according to prevail in the selection of the performance table. Qualified fan factory is rated flow, total pressure error does not exceed ± 5%, the performance of the selection list is performance under standard conditions, regardless of the technical documentation or performance are subject to the requirements of the standard state orders; 2, the fan installation can be divided into horizontal and roof type, air volume, total pressure, dimensions and other properties have special requirements; Scope: MHL3-2A, MPYH-14A (MHTFL-14A) Francis two-speed high-temperature exhaust fan, is a new type of fan exhaust fan between axial and centrifugal fan between how to use, it has a high pressure centrifugal fan, axial fan a large flow, high efficiency, energy saving and low noise, easy installation and so on. MHL3-2A, MPYH-14A (MHTFL-14A) Francis two-speed high-temperature exhaust fan, novel design, compact structure, small size, light weight, easy to install, and old-fashioned compared to centrifugal fan can save 20% When speed is less than 2000rpm, the noise level of less than 75dB for underground chamber usually exhaust ventilation and Class 2 speed things work situation, still two-speed electric ho different purpose as appropriate. Switch to a low-speed two-speed fan runs fast, with a lot of ho speed upgrade, the corresponding row is also greatly enhanced the wind, then the system immediately by the exhaust Yi become smoke situation. However, in the planning process, and we will meet the electrical control of two-speed fan exhaust fan puzzle quotes, basically speaking from how to deal with the motor windings Δ connection Y connection to double conversion and interlock, fire linkage of its own and manual control; fan in the fast circulation of defense down, and how to ensure the maximum level of credibility do smoke, how to ensure the power supply and other problems. Following on as part of the two-speed fan control discussions. Exhaust fan use, Chen Yu-conditioned (certified), exhaust fan by Wu Cheng Chen-yu air-conditioning Limited. Wu Cheng Chen-yu air-conditioning Co. (www.wccykt.com) is an industry leader in Shandong Dezhou, fans, ventilation equipment, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Chen Yu-conditioned in leadership with the staff warmly welcome all inquiries negotiations to create Chenyu air conditioning better future.