Category editors made the following categories according to the characteristics of axial fans: Material Category: Steel fan, FRP fan, plastic fan, PP fan axial fans 380, PVC fan, fan magnesium alloy, aluminum fan, stainless steel fan and so on. By Application: Ex fans, anticorrosive fans, explosion-proof, fans, and other types of special axial fans. According to the requirements of classification: pipeline, wall, post, fixed, rain and dust, mobile, and other external motor. Installation can be divided into: belt driven, direct-coupled motor. When moving, the distance between the vanes increases axial fan installation, faster time to reduce the impact of the bit stream interference effects than the speed of change in the wake of the axial fan pictures, blade acts as a sound barrier but also with increasing distance decreases. Thus, at least three parameters that affect the size of the interference noise: blade shape velocity waveform (ie blade loading), leaf blades radiating surface distance between the columns and as a sound source. Very small pitch may have two acoustic impact. If the vanes on the rotor blades interference field force established to make the rotor blades into a pulsating sound source, while the leaves are still sound barrier. 380 axial fans, rich ventilation equipment (certified), axial fans are provided by Shandong Dezhou Plumper ventilation plant. Dezhou Plumper ventilation plant (www.frtfsb.com) (www.frtfsb.com) is a leader in Dezhou, fans, ventilation equipment, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum limits to meet customer needs. Rich ventilation equipment in leadership with the staff warmly welcome all inquiries negotiations to create rich, ventilation a better future.