Two-speed fan control principle: The Company two-speed fan motors are equipped with two-speed electrically stator windings △ / XY (or Y / XY), speed connections by changing the basic principles of the stator windings to change the number of poles in order to achieve the purpose of speed, low-speed operation △ (or Y) mode, Hunan exhaust fan, high-speed operation of XY mode. Wind the electrical control box with circuit breaker, protection devices and other electrical components must be correct and reasonable choice by turbine rated capacity exhaust fan in the specification; A sound level of noise limits should be consistent with the provisions JB / T8690-1998 of. Exhaust fan can be an ordinary or special steel centrifugal fan axial exhaust fan. Exhaust fan specifications according to "fire protection design of tall buildings" in the regulations. The minimum air volume exhaust fan 7200m / h, the maximum air flow should not exceed 60000m / h (refers to a partition of the maximum exhaust air volume). Exhaust fan flow should be required to increase airflow value of not less than 10% to 20% of the surplus amount. Pressurized smoke exhaust fan pressure value shall be the most unfavorable loop system is calculated, exhaust fan impeller, and to ensure that the value of residual pressure in the stairwell 40 ~ 50Pa. The residual pressure value inside the front room, shared room, fire elevator room, refuge floors, etc. 25 ~ 30Pa. Fire exhaust fan should be consistent with the current standard JB / T10281-2001 "fire exhaust fan technical conditions." Fan exhaust system should be set separately. Exhaust fan should be in the same position or an upper layer of smoke region. Installation and maintenance: the kitchen fan is indispensable key kitchen equipment, recommended not installed in the ceiling, to be installed in the engine room and so on, roofing or exterior wall for easy maintenance of the place. Working kitchen fan due to prolonged high temperatures, humidity, smoke gases. Regular maintenance is indispensable work. Failure: 1, the impeller blade leads to oily curvature, angle deformation, air volume total pressure parameters decreased significantly, reaching less than exhaust requirements. Exhaust fan principles | Chenyu air conditioning (certified) | Hunan 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.