... GOOD SEVERCE airslide LOW PRICE EXCELLENT STRUCTURE LEADING TECHNIC WIDE USED LEADING LEVEL 1. Low noise, due to the helical suction ... so on.10. Long life. The blower bearing what we used are all double-row and Self-aligning bearing.11. The ... vibration.12. Case Material: HT200, Impeller Material: QT400.13. Widely used in many fields, especially in gas transportation, waste water treatment ...