The AII series centrifugal blower belongs to a single-stage, dual suction, and dual support structure. The electric motor drives the blower through an elastic sleeve pin coupling, which can transport gases such as air, coal gas, sulfur dioxide, sintering flue gas, etc. It has the characteristics of high flow rate, high pressure, flat performance curve, wide high-efficiency area, low power consumption, low noise, easy use and maintenance, smooth operation, and reliable sealing.