Health hazards of negative pressure in enclosed spaces

Sewer Odor Reversal: The bathroom often experiences backflow of odors, especially when the range hood or other exhaust equipment is turned on, the backflow phenomenon will be more serious and obvious. This is caused by the negative pressure generated indoors, which causes the odor from the sewer to backflow. Usually, air fresheners are used to mask the odor, but this is only a temporary solution. Because the sewer contains a large amount of toxic gases, such as methane, hydrogen sulfide, ammonia, carbon monoxide, carbon dioxide, etc., being in such an environment will irritate the eyes and respiratory system. Spread of Bacteria: The sewer also contains a large number of pathogenic microorganisms, such as bacteria, parasites, and fungi. Due to the serious negative pressure indoors, some bacteria will also enter the human body with the backflow of air from the sewer, causing skin and respiratory infections. This transmission is invisible and often overlooked by many people, but it is very serious and poses a great threat to human health. Aerosol Virus Infection: I believe everyone is familiar with aerosols, but do you know that sewers can also produce aerosols? Due to the systematic negative pressure and intermittent negative pressure generated indoors, the aerosols from the sewer backflow and adhere to toiletries and towels, causing endless harm. At the end of 2019, the novel coronavirus swept the globe and is still breaking out in various parts of the country. Once the sewer is contaminated with the novel coronavirus, when the range hood and exhaust system are used to create negative pressure, the virus in the sewer will be transmitted indoors. Because the novel coronavirus survives longer in cold, low-temperature, and humid environments, it provides ample time for negative pressure transmission of the virus. Therefore, negative pressure is the culprit in the transmission of the virus. Many cases illustrate the aerosol transmission of the novel coronavirus from sewers. For example: In 2020, the National Health Commission issued the "Diagnosis and Treatment Plan for Novel Coronavirus Pneumonia." This plan added the transmission route of the novel coronavirus: "In a relatively closed environment, prolonged exposure to high-concentration aerosols may lead to aerosol transmission." Academician Zhong Nanshan of the Chinese Academy of Engineering also reminded the public at a press conference to pay attention to the transmission of the novel coronavirus through sewers. Academician Zhong Nanshan gave an example, saying that in the Hong Kong Special Administrative Region's Kangmei Building, there were cases of infection between upstairs and downstairs residents, similar to the Amoy Gardens incident during the SARS outbreak in Hong Kong, where more than 300 people in the entire building became ill. This shows that aerosols containing the novel coronavirus can spread to every room through common sewer pipes. In 2021, the chief physician of the infectious disease prevention and control department of a municipal CDC also introduced a typical case, reminding citizens to pay attention to the safety of sewers and floor drains. At that time, three families in a residential building in a certain city were infected with novel coronavirus pneumonia. During the investigation, experts found that the three families were residents of the same unit and on the same floor, but they had no contact with each other. The first to fall ill was a resident on a lower floor, followed by those on upper floors. After in-depth investigation, epidemiological analysis, and multiple studies, experts discovered that the sewer pipes and exhaust pipes of the three families were interconnected. They then put a dye into the sewer of the lower-floor resident. Due to the force and pressure, and the large negative pressure indoors, a large amount of aerosol will be generated. The aerosol containing the virus is squeezed through the interconnected floor drains and exhaust vents to the homes of the upper-floor residents, causing infection. This case proves that interconnected sewer pipes can transmit the novel coronavirus. There are many similar cases, and the National Key Laboratory of Respiratory Diseases has many similar research results, all of which prove that aerosols carrying the virus can spread through the same sewer pipes to every room, causing cross-infection. So the key question is, why does the virus in the sewer backflow into the room? It is because of the updating of building materials, the airtightness of houses is getting better and better, and systematic negative pressure will be generated in the house. When the range hood and exhaust fan are turned on, intermittent negative pressure will be generated. The formation of negative pressure will cause the backflow of sewer odor and bacteria, resulting in health hazards. Therefore, negative pressure is the culprit in the transmission of the virus. The Qianjia ventilation pressure balancing machine can automatically balance the indoor and outdoor negative pressure, prevent the backflow of sewer gas into the room, and thus prevent the spread of the virus. The Qianjia ventilation pressure balancing machine is intelligent and user-friendly, creating a breathable room! Experience a different fresh and healthy life!

2022-04-08

The Dangers of Sewer-Spread Viruses - Omicron Edition

Since March 2022, the Omicron variant has swept through Jilin and Changchun, its high transmission rate and stealthy nature posing significant challenges to epidemic prevention and control. The entire city implemented a lockdown, with all residents placed under home quarantine. At a press conference on Jilin Province's epidemic prevention and control work, Gu Rui, vice president of Jilin University Affiliated Hospital, reminded residents to prevent gas backflow during home quarantine. This announcement has drawn significant public attention. Jilin Provincial Epidemic Prevention and Control Leading Group Propaganda Group: Preventing Gas Backflow. Firstly, when not in use, close the drain at the bottom of the washbasin and add a small amount of water to create a sealed barrier. Open it when using the washbasin. Secondly, use a deodorant drain or seal the drain with a water-filled plastic bag, removing it when needed. Thirdly, during the epidemic, use plastic film and adhesive tape to seal the bathroom exhaust fan to avoid potential gas backflow. Fourthly, close the toilet lid before flushing after use. Fifthly, when using the range hood, ensure that the washbasin, drain, toilet, and exhaust fan are sealed. Open windows to ensure air exchange to prevent negative pressure caused by the range hood from causing potential contaminated gas to backflow through indoor pipes. When not in use, temporarily seal with cling film and adhesive tape. These five methods aim to prevent virus-carrying gases from entering homes. However, many find these methods complicated, inconvenient, and difficult to implement, leading to potential health risks for those who don't follow them. What better prevention methods are there? Changchun Kuancheng District faced a severe situation during this epidemic. Due to the high population density in the area's densely populated residential areas, some mild cases during home quarantine led to the entire unit being sealed off, increasing the risk of cross-infection. Even worse, a single positive case resulted in the entire unit's residents being taken away for centralized quarantine, causing significant fear among residents. This confirms Academician Zhong Nanshan's conclusion that virus-carrying aerosols can spread through shared sewers, causing cross-infection in each room. This is a serious and widespread cross-infection pathway. Given the long-term threat posed by the novel coronavirus to public health, residents should pay close attention to this issue and take steps to eliminate the risk. Our company offers the Qianjia Ventilation Constant Pressure Machine, an independently developed product filling a market gap in constant pressure ventilation and air purification. It's been highly recommended by CCTV's "Rise of China" program! With modern buildings becoming increasingly airtight and the power of range hoods and bathroom exhaust fans increasing, this creates systematic and intermittent negative pressure indoors. Negative pressure not only causes odors and makes windows difficult to open, it also spreads viruses and can cause irreversible damage to brain memory cells. The Qianjia Ventilation Constant Pressure Machine features fully intelligent circuit control and 13 imported chips. It precisely balances indoor and outdoor negative pressure, allowing users to comfortably enjoy fresh air. The Qianjia Ventilation Constant Pressure Machine also features gas leak alarm ventilation with mobile phone alerts, indoor air purification, and ventilation heating functions. It's committed to resolving issues of air health and safety in confined spaces. The Qianjia Ventilation Constant Pressure Machine mainly automatically balances indoor and outdoor negative pressure to prevent backflow of odors and virus-carrying gases from the sewer, thus preventing virus transmission. During this epidemic, the Qianjia Ventilation Constant Pressure Machine helps you solve a series of problems caused by indoor negative pressure, including the transmission of viruses from the sewer, which jeopardizes health! Qianjia Ventilation Constant Pressure Machine – creating breathable rooms!

2022-04-08

Provincial epidemic prevention and control leading group publicity group: Prevent gas backflow.

2022-04-08

Focus on health, Qianjiameng transformation and upgrading - Interview with Shang Zhizhong, general manager of Changchun Weicheng Machinery Equipment Co., Ltd.

The "14th Five-Year Plan" proposes accelerating the development of a modern industrial system and consolidating and expanding the foundation of the real economy, including the in-depth implementation of the manufacturing power strategy and the development and expansion of strategic emerging industries. The prosperity, growth, and high-quality development of China's manufacturing industry depend on the tireless efforts and innovation of manufacturing enterprises, and on generations of manufacturing entrepreneurs. Shang Zhizhong and his Changchun Weicheng Mechanical Equipment Co., Ltd. are among the best. "Establish with precision, win with quality, innovate with wisdom, govern with virtue, and serve the country with intelligence" is a true reflection of Shang Zhizhong's long entrepreneurial journey. Along with the rise of China's manufacturing industry, the courageous, insightful, and proactive Shang Zhizhong is also writing his own chapter of struggle.

2022-03-14

Changchun Weicheng Machinery Equipment Co., Ltd. - Creating a Breathable Living Space

Creating a Breathable Home ——Interview with Shang Zhizhong, General Manager of Changchun Weicheng Mechanical Equipment Co., Ltd. In March 2003, a large-scale SARS outbreak with sudden onset occurred in Amoy Gardens, Hong Kong. Among the 296 people who died from "SARS" in Hong Kong, residents of Amoy Gardens accounted for one-seventh! What caused the large-scale SARS outbreak in Amoy Gardens? Later, Hong Kong authorities conducted tests in a unit in Amoy Gardens and found that when the bathroom exhaust fan was turned on, the negative pressure generated by the fan directly caused air to flow back into the bathroom from the building's sewage pipes through the floor drain. These air currents may have spread aerosols from the sewage pipes into the bathroom, and the bathroom exhaust fan may have also discharged these aerosols into the courtyard, eventually causing the virus-carrying aerosols to enter other houses through windows, resulting in infection of people in adjacent units—this was the root cause of the SARS outbreak in Amoy Gardens in Hong Kong that year. After the incident, the term "negative pressure in houses" was taken seriously for the first time. How is negative pressure in houses formed? What harm does negative pressure pose to human health? What measures can we take to eliminate negative pressure and maintain a healthy living environment? With these questions in mind, we interviewed Shang Zhizhong, the developer of Qianjia ventilation constant pressure machine and general manager of Changchun Weicheng Mechanical Equipment Co., Ltd. The initial intention of the research and development was to allow people to live healthier lives What is systematic negative pressure? It is the phenomenon where the indoor air pressure is lower than the standard outdoor atmospheric pressure. Due to the principle of constant atmospheric pressure, low indoor air pressure will cause other air currents to supplement the indoor air, mainly through the sewer pipes, while other pathways are closed or have high wind resistance. The long-term accumulation of odors will have a permeation effect, causing some clothes, bedding, and textiles to have odors, causing health hazards and seriously affecting the quality of life. "Nowadays, the airtightness of buildings is getting better and better, and the exhaust power of range hoods and bathroom exhaust fans is getting larger and larger, which can cause systematic and intermittent negative pressure indoors. Negative pressure not only makes it difficult to open doors and windows due to backflow of odors, but also spreads viruses and causes irreversible damage to brain memory cells. It is an invisible killer of health in the new era." Like many Chinese families, Shang Zhizhong once deeply worried about the ventilation and air purification problems in his home. However, after years of experience in the machinery industry, Shang Zhizhong examined most of the household air purification systems on the market and found that: "Firstly, the functions of air purifiers mainly focus on dealing with PM2.5, while the functions targeting volatile organic compounds are much less prominent; secondly, most air purifiers use activated carbon adsorption, and due to the limited adsorption capacity, the filter needs to be replaced frequently, otherwise, the activated carbon saturated with formaldehyde will continuously overflow and release, becoming a source of poison. Some ventilation systems also require a large amount of piping to be laid throughout the room, requiring high indoor ceiling height, complicated engineering, and for already renovated houses, especially older houses that have been occupied for many years, it is almost equivalent to completely renovating the entire house, which is almost impossible to achieve." "Even for me, an insider, it's so difficult to give my family a healthy breathing environment. China is so large, with so many families, so many elderly people and children, what can we do? How many years will it take for air environment management to improve?" This thought lingered in his mind and became a "heart disease" for Shang Zhizhong. If there's nothing on the market, then let's make it ourselves! Since this flash of inspiration appeared in Shang Zhizhong's mind, his heart has never been calm again. Shang Zhizhong did not rush into success, but first explored the technology, starting with building his own research team. To this end, he invested the savings from his many years of work, visited dozens of "big names" in the ventilation technology industry, and after many twists and turns, finally established his own R&D team. From 2016 to 2021, he and his R&D team members worked day and night in the laboratory. After 5 years of R&D, countless experiments, tests, polishing, and iterations, the Qianjia ventilation constant pressure machine was finally successfully developed. The principle of the Qianjia ventilation constant pressure machine is to use a carefully designed multi-stage filtration system and the scientific principle of slight positive air pressure, with the main unit paired with a "Breathing Treasure" to promote the flow of clean air, achieving "metabolism" of indoor air, allowing oxygen-rich fresh air to enter every corner of the room. A Jilin University professor who has close contact with Shang Zhizhong used a well-known Japanese brand air purifier in his home for two years, and frequently encountered readings exceeding the normal range. After inspection and research by Shang Zhizhong's technical team, an emergency solution was provided to the professor: installing a household constant pressure machine. After 24 hours of using the constant pressure machine, the air quality readings in the professor's home finally returned to the normal range, and the problem that had plagued the professor and his family for a long time was successfully resolved. Shang Zhizhong and the Qianjia ventilation constant pressure machine also gained their trust. In the new ventilation industry with numerous brands, why was Shang Zhizhong able to easily solve problems that had plagued other companies for years or even decades? This is inseparable from Shang Zhizhong's adherence to the new ventilation industry, and more importantly, Shang Zhizhong's cultivation of talent and innovation in technology.

2021-12-07

General Manager's Profile

Profile Shang Zhizhong, General Manager of Changchun Weicheng Machinery Equipment Co., Ltd., graduated from the Physics Department of Jilin University. In recent years, Shang Zhizhong's company has been doing very well, with remarkable efficiency: Currently, Weicheng Machinery has 5 national invention patents and 16 national utility models. In 2017, it was named a Changchun Municipal Technological Small Giant Enterprise; in 2018, a Jilin Provincial Technological Small Giant Enterprise; in 2019, a national high-tech enterprise; and in 2021, a Changchun Municipal Specialized, Refined, and Innovative Enterprise. From a junior college graduate who just left university in the 1990s to today's wealthy Chinese entrepreneur, Shang Zhizhong's journey has been extraordinary.

2021-12-07

China Enterprise Network - "Changchun Weicheng Mechanical Equipment" selected for the "Rising China" column

2021-11-04

China Development Network - "Changchun Weicheng Machinery Equipment" selected for the "Rising China" column

2021-11-04

China Machinery News Network - "Changchun Weicheng Machinery Equipment" selected for the "Rising China" column

2021-11-04

China Mechanical Net - "Changchun Weicheng Mechanical Equipment" Selected for "Rising China" Column

2021-11-04