How to choose the right negative pressure fan? 

 Today, Kunshan Shengtang ventilation and you explained some methods of cooling plants and workshops in summer, now it seems that both cost saving and obvious effect is the negative pressure fan, so today and you say how we should correctly choose the right negative pressure fan, from which several aspects to select it, as follows: FRP glass fiber (glass steel), galvanized sheet, plastic steel galvanized sheet negative pressure fan is galvanized iron plate as the material (commonly known as sheet iron), the market is very common negative pressure fan, because it is affordable, so many manufacturers choose this material negative pressure fan; However, if this negative pressure fan is installed outdoors, after a long time of rain washing, it will produce certain rust stains; Negative pressure fans made of plastic steel: rarely used on the market at present; FRP glass fiber negative pressure fan: FRP is fiber reinforced plastic. FRP characteristics: (1) light weight and high strength. (2) Good corrosion resistance. To the atmosphere, water and the general concentration of acid, alkali, salt and a variety of oils and solvents have good resistance. (3) Good electrical performance. An excellent insulating material used to make insulators. High frequency can still protect good dielectric property. Microwave transmission is good. (4) Good thermal performance. FRP thermal conductivity is low, not easy to deformation, fire resistance. Two, transmission mode: the transmission mode of negative pressure fan is divided into direct type and belt type. From the point of view of the transmission mode, the transmission mode affects the air volume, noise, and maintenance of the fan; Direct optimization. 1, direct negative pressure fan blade is directly installed on the motor, reduce the power loss generated by transmission, with the same power of the fan, the air volume of direct negative pressure fan is about 10% larger than that of the belt type; Belt type negative pressure fan belt will loosen after a long time, loose fan air volume will decrease significantly. 2, direct type also no belt friction noise; Belt type to maintain, the general fan belt can be used for two years (imported), a small number of can only be used for one year, especially installed in the high altitude of the negative pressure fan replacement is more difficult. 3. Motor: Motor is the heart of negative pressure fan. Belt type motor general type ordinary motor (except individual manufacturers matching special motor); And the direct motor is the negative pressure fan special 12 pole dustproof and waterproof grade above IP55 aluminum motor. 4. Wind blades: The wind blades of negative pressure fans are divided into aluminum alloy, stainless steel, aluminum alloy sanding, aluminum alloy magnesium alloy die casting, nylon iron and other materials. The different materials of wind blades are determined according to the different places of use. Commonly used wind blade for aluminum alloy, stainless steel, aluminum alloy sand blade. The blades of Al-Mg alloy die casting are resistant to high temperature, stable and not easy to deformation and fracture due to the characteristics of the material. Nylon and iron blades are used in acid and alkali places, usually electroplating plants and other corrosive places.