... fan blade 590x180 for 5HP air source heatpump plastic fans impellerManufacturer factory gate photo:Factory area corner photo:Injection ... treatment, to prevent mildew, permanent use4. High temperature and low temperature resistance, corrosion resistance, anti-bending, anti-fall5. Drive ... various types of axial flow fan blade products, with low noise, large air volume, anti-vibration, good balance effect ...