... :500~21000m3/h, Speed:870~3500r/min, Shipbuilding ventilation fan for shipyard use Draft fan:Weight:25~352kg,Volume:500~21000m3/h,Speed ... 22.5°. COMPANY INTRODUCTION Our company,Qingdao Chunhao Air Blower Ventilation Equipment Co., Ltd. is located in the Scientific Technology Park ... been CSS certified by the Anti-Explosion Examining Centers of ABS, BV, DNV, GL, KR, LR, NK, and RINA. Our company ...