"63 people in a movie theater in Zhejiang vomited and sent to the doctor" (hot spot | 63 people in a movie theater in Zhejiang vomited and sent to the doctor, it was related to ventilation!) After the incident, it attracted widespread attention from the whole society, and everyone was talking about it. , Why does the carbon monoxide exceed the standard in the cinema?

Liu Liang, a professor-level senior engineer at the China Academy of Building Research Co., Ltd., told reporters that when he first saw the news, he felt that the air intake of the theater air conditioner should be placed in a high-risk position. This is also a common problem in many projects. It depends on luck, but it is often inevitable that it will happen at least once in the end. The latest survey results are as expected: in this case, the fresh air outlet of the air conditioner was placed in a dangerous position, and it was too close to the exhaust gas discharge port of the boiler chimney, which was only 0.5 meters away, resulting in a "suction short circuit", and the high concentration of CO released by insufficient combustion was mixed into it. In the new wind.

This Xintiandi shopping center in Weishan Town, Dongyang City has been closed since the incident. The cinema is on the fourth floor of the shopping center, and the situation is the No. 3 cinema of the cinema. After on-site investigation and review of drawings, it was found that the fresh air intake of No. 3 projection hall on the roof of the 5th floor, after inhaling the exhaust gas from the boiler, caused the accumulation of carbon monoxide in the No. 3 projection hall, and the concentration increased, which caused the physical discomfort of the personnel inside. .

According to the relevant investigation of experts, it was determined that the carbon monoxide was only gathered in the No. 3 cinema at the time of the incident, and the indoor combustion and other conditions were excluded, and another channel connecting the No. 3 cinema with the outside world was locked - the fresh air system. The air inlet of the fresh air system is on the roof of the fifth floor. It is adjacent to the fresh air system and is only 0.5 meters apart. There is an exhaust port. This flue is the exhaust pipe of the gas boiler on the negative first floor. This exhaust pipe will discharge carbon monoxide exhaust gas when the boiler is turned on, and then be inhaled by the (fresh air system) air inlet. Mr. Liu emphasized that in the design stage, the HVAC major is often stubborn but the architecture major, and he may have tolerated it knowingly that there is a problem, but the matter of human life is at stake, we must persevere to the end, and have the courage to refuse to sign. Sometimes the pressure may come from Party A, or the construction unit adjusts at will on site. But in any case, in the final stage of acceptance, such critical errors must not be missed. There have been two plans for residential projects before (one is the project re-examination conducted by the Beijing Municipal Planning Commission, and the other is the construction plan of a multi-storey residence in Hebei that is about to be submitted for review), both of which have the flue gas from the gas wall-hung boiler. The discharge port is generally located directly below the intake port of the fresh air ventilator in the upper bedroom. After seeing it, we immediately gave a first-level warning (in the event of an accident in a residential building, it is often worse than a public construction project). There are similar situations in which the fresh air outlet is too close to the cooling tower, which leads to the occurrence of Legionnaires' disease (epidemic prevention), and the distance from the oil fume outlet is too close to cause strong indoor odor (environmental protection), etc. In fact, there is no special high-tech content, and the standards and specifications even have clear regulations, but they need to be implemented carefully by all parties involved!

GB50736 "Code for Design of Heating Ventilation and Air Conditioning in Civil Buildings" points out that mechanical ventilation should avoid short circuit of air intake and exhaust air, and the air inlet and exhaust vent should be specified in the description. The settings are specified:

HJ554 "Technical Specifications for Environmental Protection in Catering Industry" stipulates the location of the fume exhaust vent:

Standards are the product of science. Standards are to ensure product quality, but sometimes standards can also protect everyone's life safety. I hope that all walks of life can strictly implement relevant standards, respect science, and cherish life! After all, life and health are precious, and what is lost will never come back!

(The article is transferred from the public account "China Air Purification Industry Alliance CAPIA")