The suspended blower  (magnetic levitation/air suspension) is a new type of energy-saving blower. It adopts contactless suspended bearing technology and supports the rotation of the impeller through electromagnetic or air film, completely eliminating mechanical friction. Its core advantages include: 1) Energy saving of 30-40%, with variable frequency regulation precisely matching the working conditions; 2) The noise level is below 80dB, which is far superior to the 110dB of a Roots blower. 3) Completely oil-free design, maintenance-free and pollution-free; 4) It has a service life of up to 20 years, far exceeding the 5 to 8 years of Roots blowers. Compared with traditional Roots blowers, suspended blowers have significant advantages in fields such as sewage treatment, electronics and medicine, which have high requirements for clean air and noise reduction. Although the procurement cost is relatively high, long-term use can greatly reduce energy consumption and maintenance costs. With the increasing environmental protection requirements, suspended fans are gradually becoming the mainstream choice in the industrial field.