gas purification, sewage deodorization and such environments with corrosive gas. Volume Range: 1,200-216,000m3/h Static Pressure Range: 200-3,000pa Production Feature: 1, Applicable for wide range and multiple operation environment, efficient energy performance 2, Fan casing. Inlet bell and impeller of this series fan are made of pure giber glass reinforced plastic, which has completely changed the fabricating process for fiber glass reinforced plastic lined with traditional carbon-steel. 3,The bolts links the casing and iron support is treated by complete profiling wrapping method which has completely solved the issure of bolt damage due to corrosion. 4,The fan is featured with dual-level seat for easy maintenance without necessity to remove the anchor bolts