Centrifugal fan [1] is based on the principle of potential energy is converted to kinetic energy, the use of high-speed rotating impeller gas acceleration, then deceleration, change the flow of livestock breeding fan, so that kinetic energy is converted into potential energy (pressure). In the single-stage centrifugal fan, the gas from entering the axial fan impeller farming, changed into the gas flow through the radial impeller, diffuser and then enter. In the diffuser, the gas flow direction changes caused by deceleration, the deceleration effect converting kinetic energy into pressure energy. Pressure increased mainly in impeller, diffuser second place in the process. In a multi-stage centrifugal fan, and reflux into the next impeller allows airflow, resulting in higher pressure. Inlet vane adjustment, FC (forward multi-blade) fan adjustment feature (after the wing) fans better than BI (backward plate) / AF. Although less efficient than the single fan FC BI / AF fan, but in the VAV system, the fan power is reduced due to FC good characteristics, both the power consumption is almost the same culture fan wholesale prices, coupled with the FC fan having a low number of revolutions of a small and lightweight advantages, making it the VAV system more widely. BI / AF fan because of the size of the weight of the price over FC fans in the same rating occasions, with a high number of revolutions of the shortcomings, it limits its application in small VAV system, but in large and medium load applications, the use of high efficiency still hope The BI / AF-type fan. Farming fans, Qingzhou Minhua temperature control equipment, Fuyang farming fan community is provided by China Qingzhou temperature control equipment plant. Temperature Control Equipment Factory Qingzhou public Hua (www.minhuawenkong.com) (www.minhuawenkong.com) (www.minhuawenkong.com123) is an industry leader in Shandong Weifang, fans, ventilation equipment, over the years, the company is implementing the scientific management, innovation development, the principle of honesty and trustworthiness, and satisfy customer needs. Qingzhou temperature control equipment in China and China leading the staff warmly welcome all inquiries negotiations, China and China Qingzhou temperature control equipment to create a better future. You can also access (www.minhuawenkong.com/supply_details_43839505.html), for more information about the company.