Why can't we use the hotel's central air conditioner and exhaust fan?

During the quarantine period, the use of central air conditioning and exhaust fans in hotels may lead to the spread of the epidemic.

Although central air conditioning itself does not produce viruses and is not the host of viruses, it increases the air exchange between different rooms. For example, during centralized isolation, hotels use central air conditioning connected to the whole building. Once someone is infected, the virus may spread in the building through the air supply system, forming cross-pollution. Therefore, during the period of epidemic isolation, the use of central air conditioning must be stopped.

For the public building environment of the hotel, the assumption that the flow of people is complex, the virus is uncontrollable and there is no virus environment cannot be fully established. In addition, a fresh air duct is used. Once there is a virus pollution source at the source of fresh air, fresh air will "distribute" the pollution source to all the spaces in the building, so it is the safest way to turn off the central air conditioning of the hotel.