... :870~3500r/min, Pressure:490~1800Pa, Shipbuilding Fan blower for shipyard use Draft fan:Weight:25~352kg,Volume:500~21000m3/h,Speed ... Register of the Peoples Republic of China.2. WORKING CONDITIONSMedium temperature: -25 ~ +50Max relative humidity: 95%Periodical swing: ±22.5°Continued ... .318A,Jiushui Road,Licang District,Qingdao,Shandong province,China Shipbuilding Fan blower--Centrifugal ...