T30 (formerly known as 03-11 or 30K4) type axial fan is a simple mechanism, low-pressure axial fan noise. Can be used as factories, warehouses, offices, residential ventilation, heating or cooling purposes will be strong. If wind shell removed, also as a free fan. Can be produced within a longer exhaust duct, spaced installed in series to increase the total pressure of the pipeline. The axial fan gas delivered must be clean, dry, not mixed with impurities and excess steam and corrosive gases, the temperature should not exceed 45 degrees.