In the semiconductor chip manufacturing workshop, a tiny speck of dust can cause a circuit short circuit; In a cell culture laboratory, bacterial contamination can render months of research in vain. The horizontal flow ultra clean workbench is the first line of defense against these micro threats. The horizontal flow ultra clean workbench is a type of local purification equipment that provides a dust-free and sterile workspace for precision operations by creating a local level 100 clean environment. Unlike biosafety cabinets, its core design goal is to protect samples rather than operators, creating a positive pressure differential protection zone through horizontal unidirectional airflow, and becoming an infrastructure in modern laboratories and industrial production.

The core working principle is based on air laminar flow technology. When the equipment is working, indoor air is first filtered through a pre filter to remove larger particles; Then, the fan is pressed into the static pressure box to evenly distribute the air; Finally, a high-efficiency filter is used for secondary filtration, forming a clean airflow that is horizontally sent out from the rear of the equipment. This horizontal unidirectional airflow flows through the work area at a uniform cross-sectional wind speed (usually 0.3-0.6m/s), carrying away dust particles and microorganisms from the operating area, creating a highly clean working environment. The airflow direction is parallel to the operator, ensuring that the workspace maintains a cleanliness level of Class 100 according to US Federal Standard 209E, which means that the number of particles ≥ 0.5 μ m per cubic foot of air does not exceed 100. The filtration system of the equipment is the key to its high efficiency and cleanliness. The primary filter is usually made of non-woven fabric or foam plastic material to intercept larger particles; HEPA filters use ultra-fine glass fiber filter material, with a filtration efficiency of over 99.99% for 0.3 μ m particles (H13-H14 level). This dual filtration system ensures a highly clean air output. It also has flexible wind speed adjustment function. Through the adjustable air volume fan system, users can adjust the wind speed as needed to ensure that the working area wind speed is always in an ideal state. Some models are also equipped with remote infrared remote control or touch control systems, making operation more convenient.

The structural design of the horizontal flow ultra clean workbench balances functionality and durability. The box is usually made of high-quality cold-rolled steel plate with electrostatic spraying treatment or stainless steel material, with a smooth, dust-free and corrosion-resistant surface. The workbench is made of sandblasted stainless steel, which is corrosion-resistant and easy to clean. It is equipped with 5mm transparent high-quality glass baffles on both sides, ensuring sealing and not affecting the operating line of sight. The internal structure of the equipment is carefully designed, and the size of the static pressure box is optimized to the minimum. Equipped with stainless steel countertops and glass side panels, the entire studio appears spacious and bright. The high-efficiency filter adopts an ultra-thin non partition design, which ensures filtration efficiency while utilizing space. According to usage requirements, there are multiple specifications to choose from. From single person single-sided type (workspace size approximately 870 × 550 × 620mm) to double person single-sided type (workspace size approximately 1360 × 550 × 620mm), it meets the needs of different work scenarios. Some models can also be connected in series to form a super clean production line, adapting to the needs of large-scale production. The auxiliary system of the equipment is also very complete. Equipped with Philips fluorescent lamps to provide sufficient lighting (illumination ≥ 300LX), ultraviolet sterilization lamps for disinfection in the work area, universal casters and adjustable high and low feet to ensure stable placement of the equipment. These detailed designs together ensure the completeness of the device's functionality.

The cleanliness level reaches level 100 according to the US Federal Standard 209E, with a filtration efficiency for particles ≥ 0.5 μ m. Wind speed is a key parameter for maintaining cleanliness, with an average surface wind speed maintained within the range of 0.3-0.6m/s. Most devices support dual speed regulation to adapt to different operational needs. Noise control is an important indicator of equipment comfort, with noise levels typically ≤ 62dB and some models even reaching ≤ 55dB, providing operators with a relatively quiet working environment. The vibration half peak value is generally controlled at<0.5 μ m (x, y, z directions) to avoid interference with precision operations. The power consumption of the equipment varies depending on the specifications. The single person model has a power of about 280W, while the double person model has a power of about 490W. The power supply is generally AC single-phase 220V/50Hz. The size and specifications of high-efficiency filters vary depending on the model. For example, the SW-CJ-1B high-efficiency filter has a specification of 865 × 600 × 38mm, while the SW-CJ-1C model has a specification of 1355 × 600 × 38mm. The illumination in the working area is usually ≥ 300LX to ensure sufficient light in the operating area. The equipment is equipped with ultraviolet sterilization lamps for environmental disinfection before work. Some models can also be optionally equipped with anti-static devices, stainless steel drawers and other accessories to expand the equipment's functions.

Proper operation is crucial to ensure cleanliness. Preparation before use includes cleaning the workspace, turning on the UV light for 20-30 minutes for sterilization, then turning off the UV light, turning on the fan, and wiping the countertop with 75% alcohol or 0.5% peracetic acid. During formal operation, the fan should be turned on first and run for more than 10 minutes until it reaches a stable and clean state before starting work. During operation, it is advisable to minimize frequent arm movements within the workspace to avoid disrupting airflow patterns and affecting cleanliness. Never place items directly below the high-efficiency filter during work to avoid affecting the even distribution of airflow. There are also clear regulations for the placement of items. There should not be too many items stacked on the workbench to avoid obstructing the airflow. Items that are prone to particle formation should be avoided as much as possible when operating in the work area. The placement of large objects may disrupt the airflow pattern, so special care should be taken. After use, the work area should be cleaned, the countertop should be wiped with appropriate disinfectant, and finally the fan and power should be turned off. If you need to use it again, it is recommended to turn on the UV light again for 15-20 minutes to prepare for the next use. It is particularly important to note that it is not suitable for handling hazardous biological materials as it does not provide operator protection. For such applications, a biosafety cabinet should be chosen instead of an ultra clean workbench.

Regular maintenance of the horizontal flow ultra clean workbench is crucial to ensure its long-term stable operation. Daily maintenance includes cleaning equipment surfaces and work areas, checking power cords and control switches for normal operation. The pre filter needs to be cleaned regularly, usually every 3-6 months, and should be replaced after cleaning 2-3 times. Regular inspections are key to maintaining equipment performance. It is recommended to use a hot bulb anemometer to measure the wind speed in the work area every month. If the wind speed is found to be below 0.3m/s, the fan voltage should be adjusted or the filter should be checked for blockage. When the wind speed has been adjusted to the maximum but still does not meet the standard, it is necessary to consider replacing the high-efficiency filter. The replacement cycle of high-efficiency filters is usually 2-3 years, but it also needs to be adjusted according to the frequency of use and the cleanliness of the environment. When replacing the filter, first open the pre filter at the top of the air supply body, remove the fan plate, and pay attention to the installation direction of the filter (the arrow points to the laminar flow direction). After replacement, use a dust detector to check whether the sealing around the four edges is good. Common faults include insufficient wind speed, abnormal noise, and excessive vibration. Insufficient wind speed is often caused by filter blockage or fan failure; Abnormal noise may be caused by worn fan bearings or foreign objects entering; If the vibration is too large, it is necessary to check whether the equipment is placed steadily or whether the fan impeller is balanced. When the equipment is not used for a long time, it should be cleaned and covered with a dust cover, and stored in a dry and ventilated place. Regular comprehensive testing and maintenance by professional personnel can extend the service life of the equipment and ensure stable performance.

From the manufacturing of semiconductor chips to the research and development of new drugs, from food safety testing to cutting-edge biotechnology research, the horizontal flow ultra clean workbench, as a fundamental and critical equipment, safeguards the success of precision operations in many fields. With the continuous advancement of technology, this device will continue to evolve, providing solid guarantees for human technological innovation and industrial development with higher clean efficiency, smarter control systems, and more user-friendly designs.