The central air conditioner can be used! Must use outdoor clean fresh air

The central air conditioner can be used! Must use outdoor clean fresh air
There have been no newly diagnosed and asymptomatic infections in Guangdong for many days, and the epidemic prevention and control has entered a new normal stage. Especially after Guangzhou has gradually opened up its business operations in confined spaces, the use of air conditioners has attracted much attention.

Nandu reporter learned from the Guangdong Provincial Health and Health Commission and the Guangdong Provincial Center for Disease Control and Prevention on May 20 that Guangdong has issued the "Guidelines for the Use of Air Conditioning and Ventilation Systems during the Normalization of New Coronary Pneumonia Outbreaks in Guangdong Province", which clearly states that central air conditioning can be used It must be ensured that there is a clean source of fresh air, and the fresh air must come from outside. But the new wind from the computer room, corridor, ceiling is prohibited.

Basic principle: regular window opening with natural wind is preferred

The new guidelines make it clear that during normalization and control of the new coronary pneumonia epidemic, office and public places must strengthen indoor ventilation, natural ventilation is preferred, and clean electric fans or exhaust fans can also be turned on. When it is necessary to use a centralized air conditioning and ventilation system, each unit (place) should understand and master the type of ventilation system, the source of fresh air and the range of air supply.

If a separate air-conditioning system is used in an indoor place, it needs to undergo strict procedures for cleaning and disinfection. Open the doors and windows for ventilation for 20-30 minutes every day before turning on the air conditioner; after the split air conditioner is shut down, open the doors and windows in time for ventilation.

Long-term use of split air conditioners and densely populated areas (such as classrooms and large meeting rooms), the air conditioner must be ventilated for about 20-30 minutes every 2-3 hours of operation; if it can meet the needs of indoor temperature regulation, it is recommended that the doors and windows be operated Do not close completely.

The central air conditioner must have a fresh air system

According to the guidelines, the office premises in the province should be cleaned and disinfected before using the centralized air conditioning and ventilation system (including the air conditioning system without return air and the air conditioning system with return air), and passed the hygienic evaluation. At the same time, the fresh air should be ensured The source is clean, and the fresh air should be taken directly from the outside. It is forbidden to take the wind from the machine room, corridor and ceiling.

The air-conditioning system without return air should be operated in a brand-new way. The place where the fan coil and fresh air system are installed must ensure that each room can be independently ventilated. For large-deep rooms, measures should be taken to ensure that the ventilation and exhaust systems in the internal area are normal. run.

It is recommended to update or install a new air system before the air conditioning system with return air is put into operation, and put it into operation with a new air system. If it is not possible to install, you need to install a high-efficiency filter or disinfection device at the return air inlet, and adjust the fresh air volume and the number of air changes to the maximum during operation, and at the same time strengthen the ventilation of the doors and windows. If a high-efficiency filter or disinfection device cannot be installed at the return air outlet, the return air valve needs to be closed.

The air conditioner should be disabled immediately after the diagnosis and suspected case are found

The guidelines also make it clear that relevant prevention and control measures should be implemented in accordance with relevant guidelines and requirements in special places such as medical and health institutions.

When confirmed cases, suspected cases or asymptomatic infections of new coronary pneumonia are found, the use of air conditioning and ventilation systems should be stopped immediately; only when the cases have been transported to the hospital for isolation treatment, all close contacts are sent to isolation observation points for medical observation, and Only after the cleaning and disinfection of the air-conditioning ventilation system and the final disinfection of the relevant places are conducted under the guidance of the control agency, the air-conditioning can be re-activated after passing the hygienic evaluation.

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