The cleaning frequency of high-efficiency filters (HEPA/ULPA) should be comprehensively determined based on their type, usage environment, and the accompanying pre-filtration system. However, it should be clear that the vast majority of high-efficiency filters are made of disposable filter materials (such as glass fiber, PTFE membrane, etc.), and it is strictly prohibited to reuse them after cleaning. The following is the specific explanation： I. Why can’t high-efficiency filters usually be cleaned? The filter material of high-efficiency filters is ultrafine fibers (with diameters ranging from 0.5 to 2μm), which form dense pores (below 0.3μm) through a complex three-dimensional structure. Particles are captured by principles such as interception, diffusion, and inertia. During cleaning (such as with water, cleaning agents, or compressed air), the structure of the filter material can be damaged, causing fiber breakage, enlarged pore size, and a significant drop in filtration efficiency (possibly from 99.97% to below 90%). The pollutants adsorbed by the filter material (such as bacteria and chemical particles) cannot be thoroughly removed, and after cleaning, they may become secondary pollution sources. The sealing rubber strips and frames of some filters may age due to contact with liquids or cleaning agents, resulting in air leakage. Ii. Special Circumstances
As a key component in the clean air conditioning system, the daily maintenance of DOP supply air outlets is crucial for ensuring the cleanliness of the supply air and the operational efficiency of the system. The following are detailed key points for daily maintenance: Cleaning work Surface cleaning: Wipe the outer surface of the supply air outlet with a dry, lint-free cloth every week to remove dust and stains. If there are stubborn stains on the surface, you can dip a small amount of neutral cleaner and gently wipe it, then dry it with a clean lint-free cloth to avoid the residue of the cleaner affecting the quality of the air supply. Filter cleaning: It is recommended that the primary filter be cleaned every 1-2 weeks. It can be taken out and blown from the reverse side with compressed air to remove the dust on the surface. If the filter is severely contaminated, it can be rinsed with clean water (the water temperature should not exceed 40℃), dried, and then reinstalled. It should be noted that one should not use irritating cleaning agents to clean the filter to avoid damaging the filter material. Inspection and tightening Regular inspection:
The sterilization principle of xenon light is mainly based on the destructive effect of the high-intensity broad-spectrum light (especially ultraviolet rays and high-energy visible light) released by xenon lamps on microorganisms.
The Xenon pass box is an important device used in laboratories, clean rooms, and other places to maintain a clean environment when transferring items. Its core function relies on the sterilization effect of xenon lamps and the airtightness of the equipment. Daily maintenance should focus on ensuring sterilization efficiency, equipment sealing performance, and operational stability, as detailed below I. Daily Maintenance: Basic inspection and cleaning Inspection of appearance and operational status Before daily use, check whether the equipment shell is damaged or deformed, whether the door body can close smoothly, and whether the door lock is firm (to avoid a decrease in cleanliness due to poor sealing of the door body). Start the equipment and check whether the xenon lamp is lit normally (if it flickers or does not light up, problems with the lamp tube or circuit should be checked in time). Also, check if there is any abnormal noise during operation (which may indicate motor or fan failure). Internal cleaning After each use, wipe the inner cavity of the transfer window, the shelves, and the inner side of the door with a lint-free cloth dipped in 75% alcohol or neutral detergent to remove residual stains and microorganisms (to
If you need an enclosed and controlled environment for clean zones, a clean room may be your good choice. A clean room is a local air purification equipment, which can provide an environment at a higher cleanliness class. It is good at dust control, sound control and safety. It can be built and install quickly.
As we know, the laminar flow cabinet is a device to keep the material in the cabinet away from all kinds of contamination, or keep the laboratory worker and laboratory environment away from the infectious or other hazardous materials. The air streams usually blow at the same speed and in the same direction. There are two kinds of the laminar flow cabinet, one is horizontal laminar flow cabinet and the other one is vertical laminar flow cabinet. For a horizontal flow hood, the air moves from the back of the unit through HEPA or ULPA filters to the front of the work surface, it is in a horizontal direction. And for a vertical laminar flow cabinet, the air moves from the top of the unit through filters down to the work surface, it is in a vertical direction. But how to choose a laminar flow cabinet? Which direction is better, the vertical one or the horizontal one? For the vertical laminar flow cabinet, it takes up less space than the horizontal one, and the filter can be fitted on the top of the cabinet which is very easy to install. In addition, the operator will not be blown by the air as the air direction. What is more, the cabinet will be cleaned thoroughly and it
If you are new to cleanroom equipment, you may be confused by cleanroom fan filter units and air handling units. Here in this article, we would like to talk about the details of cleanroom fan filter units and air handling units. Following is the details. For a cleanroom air handling unit, which is a part of a HVAC system, it plays an important role in temperature, humidity and pressurization in the controlled environment. A cleanroom air handling unit consist of primary filters, fan, cooling coils and a mixing chamber. The primary filters are installed in front of the HEPA filters to catch some larger particles and extend the working life of HEPA filters. And fan controls can be intergrated in to fan filter control system, it also can be placed in control panels. And for cleanroom fan filter units, which will be used much better in modular cleanroom than the air handling units. Fan filter units can be used in different sizes of spaces with different cleanliness rating. And the required number of fan filters is decided by the requirements on air change rates and cleanliness. For example, an ISO class 8 cleanroom ceiling just needs 5-15% of ceiling coverage,
When you are searching for issues about quality control, you may feel confused. Because sometimes you can see “quality assurance”. “quality control” and “quality assurance” sometimes are used in a mix. But actually, they are different and they shouldn’t be used with the same meaning. What is Quality Assurance (QA)? Quality assurance is to plan production activities & requirements and ensure these requirements will be fulfilled in the whole developing and manufacturing process. Take a new high-end watch production for example. QA has to do watch research, evaluate watch design, analyze watch sales and business, contact client’s specific requirements, etc. During these processes, QA can foresee the potential problems which haven’t yet happened to the watches. Then QA will pre-define the production processes and standards to prevent these problems. What is Quality Control (QC)? Quality control is a practical activity to inspect and test the products and the production process to ensure the finished products meet quality standards. Still take the new high-end watch production for example. QC inspect watches have been produced. QC finds and rejects defective products, like watches with scratches or painted the wrong color. These defective watches will be asked to rework to ensure the goods
When you are searching for issues about quality control, you may feel confused. Because sometimes you can see “quality assurance”. “quality control” and “quality assurance” sometimes are used in a mix. But actually, they are different and they shouldn’t be used with the same meaning. What is Quality Assurance (QA)? Quality assurance is to plan production activities & requirements and ensure these requirements will be fulfilled in the whole developing and manufacturing process. Take a new high-end watch production for example. QA has to do watch research, evaluate watch design, analyze watch sales and business, contact client’s specific requirements, etc. During these processes, QA can foresee the potential problems which haven’t yet happened to the watches. Then QA will pre-define the production processes and standards to prevent these problems. What is Quality Control (QC)? Quality control is a practical activity to inspect and test the products and the production process to ensure the finished products meet quality standards. Still take the new high-end watch production for example. QC inspect watches have been produced. QC finds and rejects defective products, like watches with scratches or painted the wrong color. These defective watches will be asked to rework to ensure the goods
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