Fan loads are widely used, such as supply fans and induced draft fans of various production and domestic boiler systems, central air-conditioning fan units, fresh air units, cooling tower fans, exhaust fans in various production sites, and dryers on production lines. Fans are the main power equipment of industrial and mining enterprises. According to the statistics of relevant departments, the installed capacity of fans and pumps and motors in the country is about 35,000MW, and the power consumption accounts for about 40% of the national power consumption. When using D32 inverter in fan operation, the power saving rate is generally 20%-60%, and the investment recovery period is 1-3 years. The benefits are very significant.