On March 11, 2022, the Shanghai Municipal Government Information Office authoritatively released the results of the traceability of locally confirmed cases in response to the recent widespread outbreak in Shanghai, with the source of the infection focusing on the contamination of the environment by the virus carried by the imported cases from abroad, which triggered the local infection and led to the spread of the infection due to management negligence. It is reported that the management omission for the medium risk area Caoxi North Road 1200 (Huating Hotel).

Huating Hotel was built in 1983, is the first batch of five-star hotels in Shanghai in the last century, recently is in the period of shutdown and remodeling, and was expropriated for the isolation of the hotel. According to the Economic Observer, the Huating Hotel uses a large volume air conditioner and is open to large circulation, its internal ventilation system only one ventilation duct in the whole building, and asymptomatic infected people spread the virus through the ducts, causing multiple infections.

Over the decades, the world's ventilation system design is commonly used in the United States standards, its design index is 30% fresh air, 70% circulating air, which is based on the lack of heat recovery function and energy-saving measures, but this will lead to serious consequences: cross-contamination, one person is sick, the whole building is infected.

This traditional ventilation system in the test of the epidemic, obviously is not pass. In order to eliminate cross-infection between buildings such as hotels and guesthouses, many new buildings have adopted a 100% fresh air fresh air system. Under this fresh air system, fresh air and exhaust air are completely separated, but compared to the previous ventilation system, the core problem to be faced is: the overall energy consumption rises. Therefore, the efficiency of the important component (fan) in the whole fresh air system is particularly important.

The EC intelligent fan developed by Panshida has the following advantages:

Energy saving: Compared with the traditional AC fan can save energy about 20%-30%, part of the export products through the ERP202X, Energy Star and other certifications.

Compact structure: For general building construction, the height of the ceiling is very important, so the thickness of the ventilation products is generally required to be 200mm or less, EC intelligent fan compact structure design is fully capable of.

Low noise: As people's requirements for living and office environments become higher and higher, the advantages of EC Smart Fan's low noise become more and more obvious.

System modularization: EC intelligent fan by the independent research and development of the motor, electronic control, fan trinity, to avoid the combination of multiple parts and components with the occurrence of coordination is not coordinated.