In the construction of cleanrooms, the ventilation project plays a pivotal role. It is not only related to the maintenance of air quality inside the workshop but also closely associated with the smooth progress of the production process and the health and safety of personnel. Guangzhou Cleanroom Construction Co., Ltd., relying on years of in-depth work in the purification field, has accumulated rich experience in the design and construction of ventilation projects for cleanrooms. The following is a detailed analysis of the key points for you.

Accurate calculation of the ventilation volume is the foundation of ventilation project design. It is necessary to comprehensively consider various factors such as the area of the workshop, the height of the space, the number of personnel, the heat generation and dust production of equipment. For example, in a cleanroom with a dense population, it is necessary to ensure that there is a sufficient supply of fresh air per person per hour. Generally, it is calculated according to the standard of [specific value] cubic meters per person per hour. For workshops with a large number of heat-generating equipment, the ventilation volume should be determined based on the heat dissipation of the equipment to effectively discharge heat and maintain the temperature of the workshop within a suitable and stable range.

A reasonable airflow organization can evenly distribute purified air and effectively remove pollutants. Common airflow organization forms include unidirectional flow (laminar flow) and non-unidirectional flow (turbulent flow). Unidirectional flow is suitable for areas with extremely high cleanliness requirements, such as the core area of a chip manufacturing workshop. Through high-efficiency filters, the air flows evenly and stably in parallel streamlines, which can quickly carry away dust particles. Non-unidirectional flow is more commonly used in workshops with general purification requirements. By rationally arranging the supply air outlets and return air inlets, a mixed air flow is formed in the workshop to achieve the purpose of diluting and removing pollutants.

Different production processes have different cleanliness level requirements for cleanrooms, and the design of the ventilation system must be adapted to them. For example, in a pharmaceutical aseptic production workshop, it may be required to reach a cleanliness level of ISO 5 or even higher. This requires the ventilation system to be equipped with highly efficient air filtration devices. For example, HEPA filters have a filtration efficiency of over 99.97% for particles larger than 0.3 micrometers, and the ratio of supply air to return air and the air velocity must be strictly controlled to prevent the accumulation of dust and microorganisms.

The layout of ventilation ducts should be simple and smooth, reducing the use of elbows and resistance components. The material of the ducts should be selected according to the environmental characteristics of the workshop. For example, in workshops with the risk of acid and alkali corrosion, corrosion-resistant stainless steel or plastic ducts should be used. In general environments, galvanized steel sheet ducts are more commonly used due to their good strength and economy. Meanwhile, attention should be paid to the sealing of the ducts to prevent air leakage from affecting the ventilation effect.

The installation of ventilation equipment must be carried out in strict accordance with the specifications. Fans should be installed stably to ensure that there is no abnormal vibration or noise during operation, and vibration reduction measures, such as installing vibration pads or spring vibration dampers, should be taken. The installation of air filters should be tight, and the sealing strips should be intact to prevent unfiltered air from bypassing and entering the workshop. In addition, for large equipment such as air conditioning units, it is necessary to ensure that the internal components are firmly connected and that the refrigeration and heating systems operate normally.

During the installation of ducts, it is necessary to ensure that the slope of the ducts meets the design requirements so that condensate water can be discharged smoothly, avoiding water accumulation that may breed bacteria and affect air quality. The connection of ducts should be tight, and welding, flange connection or threaded connection can be adopted, and sealing treatment should be done at the connection points, such as winding sealing tape or applying sealant. When passing through walls or floors, sleeves should be set up, and fireproof, waterproof and sealing materials should be filled between the sleeves and the ducts.

After the completion of the ventilation project construction, commissioning and testing are of crucial importance. First, the air volume and air pressure of the fans should be tested to ensure that they meet the design requirements. Then, the air change rate and air cleanliness of the entire ventilation system should be detected. Professional instruments and equipment such as dust particle counters and airborne microorganism samplers can be used. Based on the test results, necessary adjustments and optimizations should be made, such as adjusting the fan speed and replacing filters, until all the indicators of the system meet the standards and requirements of the cleanroom.

The design and construction of the ventilation project for cleanrooms is a complex and rigorous process that requires professional knowledge and rich experience. Guangzhou Cleanroom Construction Co., Ltd. is always committed to providing customers with high-quality and customized ventilation project solutions. From design to construction, every link is strictly controlled to ensure that cleanrooms can operate efficiently and stably, creating good environmental conditions for the production and development of enterprises.