The air tightness of a ventilation system is one of the key factors in ensuring its performance and effectiveness. During the design and installation of a ventilation system, it is crucial to pay close attention to maintaining and improving its air tightness. Leaks not only affect the system's operational efficiency but can also have adverse effects on indoor air quality. Below is a detailed explanation of the importance of air tightness in ventilation systems and how to achieve good air tightness.

First, the importance of air tightness of fresh air system
1. Operation efficiency: Good air tightness can ensure the efficient operation of the fresh air system. When the system is running, if there is air leakage phenomenon, it will lead to a reduction of fresh air volume, which will affect the air exchange efficiency of the system. On the contrary, if the air tightness is good, the fresh air system can quickly and effectively provide fresh air to the room.
2. Energy saving and environmental protection: Air leakage will not only lead to a decrease in the operating efficiency of the fresh air system, but also increase energy consumption. Good air tightness can reduce energy waste and achieve the purpose of energy conservation and environmental protection.
3. Indoor air quality: The air tightness of the fresh air system has an important impact on indoor air quality. If there is air leakage in the system, it may cause outdoor pollutants to enter the room, affecting the indoor air quality. And good air tightness can ensure that the indoor air is fresh and clean.

Second, how to do the air tightness of the fresh air system
1. Reasonable design: In the design stage of the fresh air system, the structure, use, environment and other factors of the building should be fully considered, and the key components such as fresh air outlet, return air outlet and exhaust outlet should be rationally arranged. At the same time, it is necessary to ensure that the layout of the system is reasonable and the pipeline is closely connected to reduce the possibility of air leakage.
2. High-quality materials: The selection of high-quality fresh air system materials and components is the key to ensure air tightness. For example, the selection of pipes, connectors and tuyere with good sealing performance can effectively reduce air leakage.
3. Strict construction: When installing the fresh air system, the construction should be carried out in strict accordance with the design requirements to ensure that the pipeline is tightly connected and without gaps. At the same time, professional sealing materials should be used to seal the interfaces and gaps to enhance the air tightness of the system.
4. Regular inspection and maintenance: The air tightness of the fresh air system needs regular inspection and maintenance. Regularly check the sealing performance of pipes, connectors, tuyere and other components, and timely find and repair air leakage problems.

5. Strengthen the air tightness of the building envelope: In addition to the air tightness of the fresh air system itself, the air tightness of the building envelope also affects the operation effect of the fresh air system. Therefore, in the process of architectural design and construction, the air tightness design of the building envelope should be strengthened, such as the use of external wall materials with good sealing performance and the setting of insulation layers to reduce the impact of the external environment on the fresh air system.

The problem of air leakage leads to the waste of energy. In winter, cold outdoor air enters the room through air leaks, making the heating system work harder to maintain the indoor temperature, which increases energy consumption. Similarly, in the summer, the intrusion of outdoor hot air will also increase the burden of air conditioning systems, further aggravating energy waste.

1. Air leakage test: Through professional air leakage test equipment, the fresh air system is tested to evaluate the leakage rate of the system.

2. Pressure difference method: Evaluate the air tightness performance of the fresh air system by measuring the air flow under a specific pressure difference.

3. Visual inspection method: Through visual inspection of the fresh air system pipes, interfaces and other parts, check whether there is air leakage phenomenon.

Third, the evaluation method of air tightness of fresh air system.

In short, the air tightness of the fresh air system is crucial to ensure its performance and effectiveness. Through reasonable design, high-quality materials, strict construction, regular inspection and maintenance and strengthening the air tightness of the building envelope, the air tightness of the fresh air system can be effectively improved to ensure its efficient and stable operation.