Principle of building system negative pressure

Building system negative pressure exhaust refers to the exhaust fan exhausting air outdoors, creating negative pressure indoors. According to the principle of atmospheric balance, outdoor fresh air directly enters the room through the exterior wall air inlet. In the use of European residential ventilation, the building system negative pressure unidirectional flow system is the mainstream technology on the market. It is a unidirectional flow system with two methods: a separate independent single-host ducted exhaust system and a separate independent modular ductless combined exhaust system.

2021-04-26

The importance of ventilation equipment and why ventilation is necessary

Nowadays, most urban residents live in buildings made of reinforced concrete with aluminum alloy windows and doors. These are tightly sealed and poorly ventilated. High-rise buildings in bustling city centers, in particular, have windows and doors that remain closed year-round due to concerns about vehicle noise and excessive dust – resembling concrete cans. This inevitably leads to poor indoor ventilation. Ventilation equipment is then needed to mechanically or naturally introduce sufficient fresh air into the indoor space, while simultaneously expelling polluted air that does not meet hygiene standards. This equipment ensures that the indoor air quality meets both hygiene requirements and the needs of the production process.

2021-04-23

Classification of ventilation equipment

A common ventilation device in our lives—the ventilation constant pressure machine—uses mechanical or natural methods to deliver sufficient fresh air into indoor spaces while simultaneously exhausting foul air that does not meet hygiene standards. This ensures that indoor air quality meets hygiene requirements and production process needs. The ventilation facilities within a building are collectively referred to as ventilation equipment; they not only provide good ventilation but also offer economic advantages. Many people are not very familiar with the classifications of ventilation equipment. A good classification of ventilation equipment is beneficial for its future use.

2021-04-21

The negative pressure caused by the range hood is disrupting my life

The negative pressure caused by the range hood has been a nuisance in my life. The story begins in the summer of 2016. That year, my daughter was born. It was a surprise, a gift from God, so we named her Jia En. I rarely cooked before, but with the arrival of my new daughter, I started learning to cook. I was quite clumsy at first, making a mess of things. I mainly made stews, such as chicken and mushroom stew, and beef brisket and persimmon stew. But when the range hood was on, there was no problem in summer because the windows were open. In winter, however, problems arose. The doors and windows were closed, and the indoor-outdoor temperature difference reached 50 degrees Celsius. Opening the windows to let in cold air was unbearable. My house is 140 square meters. After the range hood was turned on for 5 minutes, there was a foul smell, and the door was difficult to open. Because my mother was taking care of my daughter, after the range hood was on for 5 minutes, she would experience dizziness and tinnitus. To solve this problem, we had to open the entrance door and use the latch to hold the door open, leaving a small gap for air to Enter. The negative pressure in the room caused a series of problems. Opening the door required a lot of force. Later, I researched indoor negative pressure problems with my university colleagues and found that nearly 90% of households have this problem, especially the serious harm of intermittent negative pressure to the human body. Therefore, I started to develop the "Qianjia brand ventilation pressure balancing machine." This device is a patented invention that completely solves the problem of indoor negative pressure. It is especially suitable for homes ranging from 50 to 200 square meters. It uses an industrial-grade fully intelligent circuit board, which is safe and stable. When the indoor and outdoor pressure difference reaches 20pa, the constant pressure function is activated. It has two modes: winter and summer. In winter, it automatically heats the incoming air to prevent cold air from causing discomfort. It filters the incoming air, ensuring health. It also has an independent heating function and a natural gas leak ventilation alarm function to prevent the nearly 1,000 accidental deaths caused by natural gas leaks every year. The indoor and outdoor casing is made of stainless steel, which is beautiful and easy to install. The 90-millimeter wall hole diameter is compatible with air conditioners. From now on, say goodbye to negative pressure and enjoy the delicious food you cook. Qianjia Electric Appliances is committed to creating a new quality of life! Changchun Weicheng Mechanical Equipment Co., Ltd.

2021-04-07

Qianjia ventilation constant pressure machine

Qianjia Ventilation Constant Pressure Machine Everyone has had this experience: when traveling, going out, or leaving home for a period of time, windows cannot be opened, otherwise there will be a lot of dust and it will be unsafe. Upon returning, you find that the indoor air is murky and has a foul odor, which takes a long time to dissipate even after opening windows and doors for ventilation. Or, if you encounter haze or strong winds, your mood will be completely ruined. What causes this? Whether in southern or northern buildings, there are centralized exhaust and drainage systems, which can cause negative pressure in the room. What is 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 drainage pipes, as other pathways are closed or have high wind resistance. The long-term accumulation of odors has a permeation effect, causing some clothes, bedding, and textiles to have odors, causing health hazards and seriously affecting the quality of life. The Qianjia ventilation constant pressure machine can easily solve the above problems. The fully automatic intelligent computer can measure the basic negative pressure in the room with an accuracy of one ten-thousandth (i.e., one atmospheric pressure is approximately 10030 Pa). A pressure difference of one Pascal is enough to activate the Jilin ventilation constant pressure system and filter the incoming air. In winter, it can also be used for heating and disinfection. (Refer to the instruction manual for specific operating methods.) Qianjia Electric Appliances, Warm and Comfortable Choose Qianjia, Happiness for the Whole Family Proudly presented by Changchun Weicheng Machinery Equipment Co., Ltd.

2021-04-02

Why is the negative pressure phenomenon becoming increasingly severe?

Changchun Weicheng Machinery Equipment Co., Ltd. Why is the negative pressure phenomenon becoming increasingly serious? This needs to be discussed from two aspects. Firstly, the current living environment and building construction technology level are gradually improving, especially the window and door technology is becoming increasingly soundproof, airtight, and heat-insulating, which is quite different from the past. Others, such as the wall insulation performance, are also gradually improving, strengthening the airtightness invisibly. Secondly, the popularity of range hoods has become a standard configuration for almost every household, and the same is true for bathroom ventilation. When the windows and doors are closed in spring, autumn, and winter, and the range hood and exhaust fan are turned on, negative pressure will be instantly generated indoors, especially for the several major brands of range hoods such as Boss, Fotile, and Midea, which have under-range hoods, resulting in more negative pressure over 1000pa. So the problem is, the law of conservation of mass tells us that the air sucked out needs to be replenished (atmospheric pressure), so from where does it come in? All gaps leading to the outside are channels, so the doors are difficult to open, sewer odor may back up, the main supplementary airflow will enter the room, causing unpleasant odors inside and potentially spreading viruses, because the sewers are the concentrated sewage, mixing the sewage of a building. Many people are troubled by this and have bought many anti-odor floor drains to solve the problem of sewer odor backflow, but their effect is minimal, which is merely a temporary fix that does not address the root cause. Qianjia Appliances

2021-03-29

Negative pressure hazards

Qianjia Appliances The many dangers of negative pressure Viruses spread through it Intermittent and repeated damage to the brain Memory decline and early tremors Unbearable room odor System negative pressure is like a devil Gas leaks can kill Qianjia protects a good life Changchun Qianjia Appliances

2021-03-26

Negative pressure fan

Negative pressure fans utilize the principle of air convection and negative pressure ventilation for cooling. They work by drawing in fresh air naturally from the opposite side of the installation location—a door or window—and quickly forcing out the stuffy indoor air, improving any poor ventilation issues. The cooling and ventilation effect can reach 90%-97%.

2021-01-26

What is positive pressure, and what is negative pressure? What are their differences?

The use of positive pressure is commonly encountered in industrial applications, particularly when selecting miniature pumps (such as miniature booster pumps, miniature air pumps, miniature inflation/deflation pumps, miniature gas circulation pumps, miniature inflation pumps, miniature charging pumps, etc.).

2021-01-26

What causes sewer odors and small flying insects inside the house?

This is a common problem in residential buildings today. When the range hood or exhaust fan is turned on, it creates negative pressure inside the room. Under the action of atmospheric pressure, the indoor and outdoor air pressure is balanced, and the air extracted by the range hood and exhaust fan is forcibly supplemented. Due to the strong sealing performance of doors and windows, it is difficult for air to Enter through the gaps, and can only Enter through the sewer pipes.

2021-01-22