The fresh air system is a device that sends fresh outdoor air into the room after filtering through an air supply device. Its core function is to ensure the oxygen content and cleanliness of the indoor air. The high efficiency of the fresh air system is inseparable from its advanced purification technology. The following are six common fresh air system purification technologies:
HEPA (High Efficiency Particulate Air Filter) is a widely recognized high-efficiency filter material. It is composed of multiple layers of continuously folded sub-glass fiber membranes and is usually used in air purifiers. The surface area of the HEPA filter is large, and when unfolded, it increases by dozens of times compared to when folded, so the filtration efficiency is very outstanding. Its purification principle is based on the principle of particle inertia and diffusion, and can effectively intercept tiny particles in the air, such as dust, pollen, bacteria, etc.
Electrostatic dust collection technology uses the principle of high-voltage electrostatic adsorption to filter pollutants in the air. It uses the high-voltage strong electric field to adsorb particles on the negative or positive plates, and uses the principle of mutual attraction between different charges to achieve purification. This technology is widely used in indoor air purifiers and can effectively remove large particle pollutants in the air.
Activated carbon is divided into three types: coconut shell, fruit shell and coal. Coconut shell activated carbon has the strongest adsorption capacity. The porous structure and large specific surface area of activated carbon enable it to adsorb small particles in the air, such as odors, chemical gases, etc. Its purification principle is to use the physical adsorption of activated carbon to adsorb harmful substances on the surface of activated carbon.
Negative ion technology generates a large amount of negative ions, also known as negative oxygen ions, through a negative ion generator. Negative ions have the functions of sedation, hypnosis, analgesia, increasing appetite, and lowering blood pressure. After a thunderstorm, people feel happy because of the increase in negative ions in the air. Negative ions can reduce pollutants, nitrogen oxides, active oxygen produced by cigarettes in the atmosphere, etc., reducing the harm of harmful substances to the human body. In addition, negative ions can neutralize positively charged airborne dust and make it settle, thereby purifying the air.
Ozone is a strong oxidant, and its purification principle is based on its strong oxidizing property. Ozone can oxidize organic matter, odor molecules and the functional structure of microorganisms in the air, making them inactive, thereby achieving the effect of sterilization and deodorization. This technology is widely used in air purifiers and can effectively remove odors and bacteria in the air.
Photocatalyst technology is a technology that uses new composite nano high-tech functional materials. Photocatalysts (such as titanium dioxide) can produce catalytic effects under ultraviolet light, exciting surrounding oxygen and water molecules into highly active free radicals. These free radicals can decompose harmful organic substances and some inorganic substances in the air, thereby purifying the air. Photocatalyst technology requires ultraviolet light to work, so you need to pay attention to the configuration of the light source when using it.
The fresh air system can effectively remove pollutants from the air and ensure the cleanliness and safety of indoor air through a variety of advanced purification technologies. HEPA high-efficiency filtration technology, electrostatic dust collection technology, activated carbon adsorption technology, negative ion technology, ozone sterilization and deodorization technology and photocatalytic decomposition technology each have their own advantages, which together constitute the powerful purification ability of the fresh air system.
Choosing a suitable fresh air system can effectively improve indoor air quality and create a healthy and comfortable living environment for people.
Dear Friends,
We sincerely invite you to visit the booth of KLC at THE BATTERY SHOW North America 2025!
Date: OCTOBER 6-9, 2025
Venue: Huntington Place Detroit, MI
Booth Number: 5541
KLC focuses on production environment control, industrial air purification solutions, etc., and is committed to providing efficient and sustainable environmental technology equipment and services for the global new energy industry.
✅ The world's leading lithium battery production environment control solution
✅ One-to-one technical consultation & industry solution customization
We look forward to communicating with you face to face about industry trends and exploring new boundaries of environmental technology in the new energy industry!
Sincerely Yours,KLC Teams
The main materials of clean booth directly affect the cleanliness and effect of clean booth. Whether the maintenance is proper directly affects the service life of clean booth.
What materials are used in clean booth:
1. There are generally three types of frame materials for clean booth: stainless steel square tubes, iron square tubes, and aluminum profiles.
2. There are generally three types of materials for the top of clean booth: stainless steel plates, cold-rolled steel plates sprayed with plastic, anti-static mesh curtains, and organic glass.
3. For the clean air supply part, FFU laminar flow hoods (FFU fan filter units) are generally selected.
4. The enclosure materials of clean sheds generally include: anti-static curtains, (anti-static) organic glass.
The functional definition of the design concept of clean booth has mentioned that "controlling the main production process in a smaller environment is also a choice for clean booth design." In fact, this is the application concept of clean booth, with low investment and control of the main process. Since the control point is higher, the cleanliness level of the clean work booth is generally designed to be very high, generally ISO level 5 and level 4, and a few use level 6.
Clean booth is an air purification equipment for local high clean environment. Clean booth is mainly composed of box, fan, primary air filter, damping layer, lamps, etc., and the outer shell is sprayed. Clean booth can be hung or supported on the ground, with compact structure and convenient use. It can be used alone or connected in multiples to form a strip-shaped clean area.
Clean booth is generally referred to as clean booth, dust-free room, etc. Generally, film enclosure is used, so it is more appropriate to call it clean booth. It is also most appropriate to understand it as clean booth if it is not polluted.
High-efficiency air outlets are ideal terminal filtration devices, widely used in medicine, health, electronics, chemicals and other industries. In order to verify whether the clean room can meet the cleanliness requirements, it is necessary to test the clean room and high-efficiency air outlets, so its detection is very important.
How to measure the air volume of high-efficiency air outlets:
1. You can use the air volume hood to directly aim at the nozzle for one-time measurement, direct measurement. Since your nozzle has many small holes (to make the air volume uniform) and there is a grille, then your anemometer can be kept 3-5 cm away from the nozzle. If you have a thermal anemometer, try to face the gap instead of the grille, and measure the average value by the grid method. The same cross-section can be measured.
2. You can measure at multiple points at a distance of 2 times the width of the diffuser from the air outlet. The measuring points should be like a grid and then the wind speed is averaged. The sizes of these vents are similar. Use tinplate or even plastic board to make a barrel that is slightly larger than the cross-section of the air outlet. When measuring, cover the barrel on the air outlet and use the anemometer to measure the nozzle of the barrel at multiple points and then calculate the average value.
3. Through the clean air conditioning circulation fan, through the high-efficiency air filter, medium-efficiency filter, and primary air filter, clean air can be obtained. The cleanliness is different and the wind flow direction is different. Of course, it is also necessary to supplement some fresh air through the fresh air outlet, otherwise people will feel stuffy inside.
Air volume measurement of high-efficiency air outlet:
1. The detection method of high-efficiency air outlet uses active sampling and passive sampling. Active sampling uses filtering method and impact method. Filtration method allows a certain amount of air to pass through an analytical filter.
2. The impact method can use Anderson sampler, Lute centrifugal sampler, and slit sampler. Passive sampling uses the landing method. Use the principle of diffusion of the open agar plate of suspended particles.
3. Of course, with the development of science and technology today, some more sophisticated detection instruments can also be used to quickly detect it.
KLC will participate in CLEANFACT & RHVAC VIETNAM 2025
Date: September 11-13, 2025
Venue: National Exhibition Construction Center (NECC) - 1, Do Duc Duc Street, Me Tri, Nam Tu Liem, Hanoi
KLC Booth No: A43
As a leading company in the field of air purification systems, KLC will showcase the latest innovative technologies, energy-efficient solutions and cutting-edge products at this exhibition. Whether you are an industry professional, a distributor, or a partner seeking technical cooperation, we have prepared a wealth of display content and interactive opportunities for you:
✔ Latest product and technology display – Explore KLC's latest research and development achievements in HVAC, air purification, cleaning equipment and other fields
✔ On-site expert consultation – Our team will provide you with professional answers and customized solution suggestions
✔ One-on-one business negotiation – We look forward to in-depth exchanges with you to discuss market trends and business cooperation
✔ On-site interactive experience – Some products support on-site demonstrations, allowing you to more intuitively understand their performance and advantages
Nowadays, many companies need to produce products in a clean room, such as large food production and processing and electronics production factory. Therefore, many companies are using clean room. The reason why clean room can be dust-free is mainly because a lot of high-tech purification equipment was installed in the clean room during decoration.
1. The air inlet system of clean room must be installed filter box, and a central purification air conditioner (the central purification air conditioner must be divided into three filter sections: primary efficiency /medium efficiency/high efficiency) with a high-efficiency air supply port at the end. It's necessary to install a purification booster box if need.
2. the return air system of clean room must be installed, including a return air outlet, a pre filter, and a middle filter return air box.
3. Enter the buffer zone before entering cleanr room. Electronic interlocks are installed on the buffer zone door, and clean storage cabinets and air fresheners are placed in the changing area. People and goods entering the clean room, must pass through the air shower, cargo shower room, and use pass box to mainly transfer small items.
4. In the clean room, vertical clean bench, laminar flow hood (FFU), clean booth (removable clean booth) and self-purifier should be installed in some places that need to reach level 10-1000. Laser dust particle counter for measuring the cleanliness of clean rooms.
5. The clean room build should be designed with observation windows to facilitate visits.
Clean room equipment：
1、Air shower, changing room and clean room are the three basic components of the workshop purification system. The air shower is a passage in and out of the clean area. The high-speed clean air jetted out can effectively and quickly remove dust and bacteria carried by the human body. The clean room uses interlayer color steel plates to isolate the space and walls, the upper color steel ceiling is suspended, and the floor is paved with epoxy resin.
2、The most important role of air purification equipment in a clean room is to control the cleanliness, temperature and humidity of the atmosphere that products are exposed, so that products can be produced and manufactured in a good environmental space. This space is called a clean room.
3. According to the clean room management regulations, the dust-free purification level is mainly determined based on the number of particles per cubic meter of air that are greater than the classification standard. But for optical structures, a small dose may produce a very large amount, so air purification equipment is needed to build in clean room.
The above content is the purification equipment that needs to be used in the clean room. Different purification levels have different requirements for purification equipment. This mainly depends on the production needs of each enterprise.
SEMICON SEA, the annual event of the global semiconductor industry, has come to a successful conclusion at the Marina Bay Sands Convention and Exhibition Center in Singapore. As the largest and most influential semiconductor exhibition in Southeast Asia, it brings together semiconductor equipment, materials and service suppliers from all over the world. Here, practitioners in the semiconductor market of various countries have obtained the most complete face-to-face technical exchange and cooperation platform to jointly explore new concepts, new trends and development space in the industry, and also create an excellent opportunity for enterprises to explore and develop the Southeast Asian market.
KLC brought a full range of air purification system solutions and other series of air filters and clean room equipment to the SEMICON SEA exhibition stage, winning the favor of partners from all over the world.
The exhibition is scheduled, and cooperation is boundless. In the future, KLC will continue to use "technological innovation" as the engine, constantly polish, and strive to provide more efficient and sustainable air purification system solutions for global customers. KLC SEMICON SEA 2025 has come to a successful conclusion. Thank you to everyone who pays attention to KLC. We will continue to work hard to contribute more to the air purification of the semiconductor industry!
Now there are many laboratories are using the air purification program, that is, we often say sterile laboratory, this laboratory generally needs to use the air shower room.
Must the sterile laboratory have an air shower?
Entering the sterile laboratory must be strictly through the air shower flushing channel. Because the human is a huge biological material, therefore, sterile laboratory to implement strict personnel and physical evidence separation." For this reason, in order to prevent contamination from irrelevant personnel entering the laboratory, a set of fingerprint access control system is set at the door of the sterile laboratory. In addition, the floor of the laboratory door is also laid with sticky mat, before entering the laboratory, feet step on the sticky mat can stick to the dust on the shoes and then enter the air shower buffer channel.
Sterile laboratory requirements:
1. The velocity at the air supply outlet in the dressing room and operation room of the purification room is ≥ 0.3m/s, the air speed in the air shower room is ≥ 15m/s, the static pressure difference between the operation room and the environment of the purification room is ≥5Pa, and the system noise is ≤60dB.
2. The second-level (P2) aseptic room is 10,000 grade and local 100 grade, which conforms to the current universal American federal 209E standard.
3. The secondary asepsis room includes high, medium and primary effect filter system, small central air conditioning system, laminar air supply and well return air. The body automatic induction system is adopted in the dressing room and air shower room.
4. In addition to the characteristics of the secondary aseptic room, the third-level (P3) aseptic laboratory also specially sets up electronic interlocking doors, interlocking of transfer Windows and doors, epoxy resin self-leveling ground and water disinfection facilities.
5. The secondary biosafety cabinet is configured. The laboratory and buffer room are both negative pressure Spaces. The relative pressure of the experiment room is -30Pa to -40Pa, and the relative pressure of the buffer room of the purification room is -15Pa to -20Pa.
The role of the air shower in the laboratory:
The main purpose of using the air shower is to ensure the isolation of the laboratory and the outside world. Air shower room can effectively solve the laboratory buffer scheme: air shower room is one of the best purification equipment into the laboratory buffer. It uses high-speed air to blow off and remove particles attached to the surface of clothing or materials. Prevent the staff to bring hair, dust, bacteria into the laboratory, to meet the strict dust-free purification standards of the work site.
When it comes to livestock production, the health of the animals themselves, and the environmental problems of the sheds must be of the greatest concern. Many owners of animal husbandry are very surprised: "The same livestock, the same shed, the same feed, why our livestock morbidity is higher than others, production capacity is not as good as others?"
And next, Let us see what are the main reasons? And how to solve them.
Livestock temperature
The enclosure of the shed is better. This ensures the stability of the whole house environment. It will also be due to poor ventilation, leading to the heat in the house is not easy to emit, and then the temperature in the house is too high. Poor closure of the shed, ventilation is very good, but the winter temperature is low, will also lead to the house temperature is too low. The house temperature is too high or too low, will seriously affect the performance of livestock production.
The air humidity in the house is too high, the airflow speed is too fast, and the illumination is too little, which will lead to the temperature reduction. In turn, the air temperature is also too high, which reduces the productivity of livestock.
Dust and microbes
Due to the excretion of livestock itself, it will lead to the breeding of microorganisms, dust and bacteria. If the air circulation in the house is poor, microbes, dust, bacteria continue to accumulate, it will affect the health of livestock. Such as foot and mouth disease, influenza, panting and so on. This leads directly to reduced productivity and even death of livestock.
Harmful gas
Livestock respiration, excretion and decomposition of organic matter will lead to the appearance of harmful gases. Therefore, there is a great difference in the composition of the air inside and outside the house. Excessive accumulation of harmful gases can also directly affect the health of livestock, resulting in reduced productivity, and even death.
Now that we know these reasons, how can we solve the above problems?
Because the main thing is to improve the air environment in the shed, it is necessary to install ventilation system in the barn, in order to stabilize the air temperature in the barn. Through stable airflow, dust, microbes, bacteria and toxic gases will be brought out of the house, and fresh air outside the house will be introduced to balance the air quality inside the house.
Taking the pig farm as an example, we put forward the following ventilation methods to improve the air environment and the production capacity of the pig farm by combining various elements such as the season, the difference between male and female pigs and the actual pig farm environment:
Negative pressure ventilation filtration
Negative pressure ventilation is to install the main filter wall at the front end of the cooling water curtain, and install the ceiling filter box on the ceiling ventilation window.
In winter, fresh air enters the ceiling through the top ventilation window, filters through the ceiling filtration system and enters the pigsty, and exhaust gas is discharged by the fan.
In summer, fresh air enters the barn only after being filtered by the main filter wall, and exhaust gas is discharged by the fan. There is negative pressure inside the piggery.
◆The negative pressure ventilation filter requires large area, low replacement frequency, low ventilation energy consumption, and strong regional applicability.
Positive pressure ventilation filtration
The main filtration wall is installed in the filtration room. The positive pressure fan is installed in front of the main filter wall. Fresh air enters through the filter screen and enters the main filter wall under the action of the fan.
In winter, the filtered air enters the ceiling through the ceiling ventilation window and enters the pigsty through the ceiling small window.
In summer, the filtered air passes through a wet curtain and enters the piggery. Exhaust gases are removed by shutters and the air pressure inside the house is higher than outside.
◆ There is less risk of unfiltered air entering the house, which is the advantage of positive pressure ventilation. But higher fan power is the guarantee of reliable operation of positive pressure ventilation. The selected fan must be able to provide sufficient air volume under high static pressure difference.
Balanced ventilation or micro-positive pressure ventilation
Neutral ventilation is between negative pressure ventilation and positive pressure ventilation, and generally adopts a partial positive pressure way. Mainly used in boar station. Neutral ventilation combines the advantages of positive pressure ventilation and negative pressure ventilation. The front end is positive pressure inlet air and the back end is negative pressure exhaust air, forming an orderly ventilation flow direction. But relatively speaking, the investment is higher, the operating cost is better.
So, how to choose the appropriate filtration ventilation scheme?
◆ The choice of filtration ventilation scheme depends on the air cleanliness level L6 or L9 of the pig farm and the location of the pig farm;
Positive pressure ventilation filtration is the best choice for boar station and SPF breeding farm.Positive pressure ventilation filtration is the best choice for boar station and SPF breeding farm.
The negative pressure ventilation filtration design is recommended for thermal emergency sensitive areas and pig breeds. Ensure good ventilation effect and low energy consumption to meet the actual production needs.
There are the following points to pay attention to in the use of air filtration system:
1) Before the piggery air filtration system is put into use, it is necessary to test the air tightness of the piggery, the installation of the filter and the airflow pattern in winter and summer to ensure the operation effect of the system.
2) If the system of the unit is not used, there should be detailed operation guidance for filter replacement.
3) When to replace the filter is also an issue we need to consider. The best scheme is to decide whether to replace the filter according to the pressure transformation of each layer (positive pressure air filter unit can be realized). However, many systems do not test the static pressure difference, and filters can be used to change according to the cycle.
Dear friends,
We are extremely excited to invite you to visit SEMICON SEA 2025 and explore the cutting-edge technology and unlimited possibilities of the semiconductor industry with KLC!
Date: 20-22 May 2025
Location: Sands Expo and Convention Center, Singapore
Booth： L3201
Let us meet at SEMICON SEA 2025 and open a new chapter in the semiconductor industry together!
As a vital part of the medical field, the design of the air supply system of the clean operating room is directly related to the safety and efficiency of the operation. However, the existing air supply devices have some obvious limitations, including insufficient anti-interference ability and difficulty in meeting the personalized needs of doctors and patients for environmental temperature and humidity. In response to these problems, there is an innovative air supply solution-wide-mouth low-speed air curtain different temperature and speed air supply system.
Analysis of existing problems
Currently, the laminar air supply device of the clean operating room faces two major challenges in practical application:
Although the laminar air supply device of the clean operating room is originally designed to create a sterile environment, it is often discounted due to the interference of the surrounding airflow. This interference not only weakens the scope of the clean area, but also affects the ability of the surgical area to maintain a sterile state, which is a problem that cannot be ignored for surgical environments that require extremely high cleaning standards.
On the other hand, the air supply system of the operating room often adopts a unified temperature and humidity setting, lacking the ability to adjust it in a personalized manner. This "one-size-fits-all" air supply method cannot take into account the diverse needs of surgical staff and patients for environmental comfort, especially in temperature and humidity sensitive surgeries, which may have an adverse effect on surgical results and patient recovery.
Limitations of traditional countermeasures
In order to resist the intrusion of external airflow, one of the traditional solutions is to add enclosures around the air supply device. This design can block the surrounding airflow to a certain extent and protect the purity of laminar air supply. However, this method is not perfect. Too high enclosures may hinder the operation of the surgical team and affect the smoothness and efficiency of the operation.
Another traditional countermeasure is to use high-speed air curtains to reinforce the air supply airflow in order to improve its anti-interference ability. Although this can stabilize the air supply to a certain extent, the high-speed airflow may cause discomfort to the personnel in the operating room, especially in operations that require delicate operations. Excessive wind speed may interfere with the surgical process and even affect the results of the operation.
Proposal of innovative solutions
Based on an in-depth analysis of the limitations of the existing clean operating room air supply system, an innovative and breakthrough air supply system design solution is proposed.
This system cleverly arranges three independent and collaborative air supply boxes directly above the operating table. The central box plays the role of main laminar air supply, focusing on providing warm and low-speed clean air to the surgical area to ensure the sterility of the surgical site.
The boxes on both sides are equipped with wide-mouth low-speed air curtain air supply devices, which create a comfortable working environment for surgical personnel with lower temperature and humidity and higher wind speed. This ingenious design of different temperatures and speeds not only significantly improves the anti-interference ability of the air supply system, but also more finely regulates the microenvironment of the surgical space, meets the personalized needs of the surgical site and surgical personnel for temperature and humidity, and thus provides a strong guarantee for the smooth progress of the operation.
The middle box of the new air supply system is responsible for providing circulating air with higher temperature and lower wind speed to form a sterile and dust-free local environment, while taking into account the comfort of the anesthesiologist. The air curtain air supply devices on both sides provide clean air with lower temperature and higher wind speed to meet the dynamic needs of surgical personnel and effectively eliminate dust and bacteria during the operation.
In addition, the system also achieves precise control of the air supply temperature by configuring different air handling units to meet the needs of different types of surgeries. For example, in cardiac surgery or brain surgery, the system can quickly adjust the air supply temperature to meet the strict requirements of temperature changes during surgery.
The wide-mouth low-speed air curtain variable temperature and variable speed air supply system is not only innovative in technology, but also has significant advantages in practical applications.
It improves the cleanliness of the operating room and the comfort of the surgical staff by optimizing the structure and air supply mode of the air supply device, while reducing energy consumption, which helps promote the sustainable development of the medical industry.
In air conditioning systems for cleanrooms and other high-cleanliness environments, fan filter units (FFUs) are one of the core devices for achieving air cleanliness control. FFUs ensure the purity and uniform distribution of indoor air through their efficient air filtration capabilities and stable airflow organization, and work together with dry coils (DCs) and other components to maintain the environmental conditions of cleanrooms.
High-efficiency air filtration and airflow organization
FFUs have built-in high-efficiency filters that can remove particles in the air, including dust, bacteria, and viruses, to ensure that the air delivered to the cleanroom meets high cleanliness standards.
At the same time, FFUs form stable vertical laminar or turbulent airflow organizations through the operation of their built-in fans to avoid local contamination. This stable airflow organization is essential for maintaining the cleanliness of cleanrooms, especially in the semiconductor manufacturing and biopharmaceutical fields where cleanliness requirements are extremely high.
Collaborative work and application scenarios
In dry coil systems, FFUs work together with dry coils (DCs) and other components (such as fresh air units MAUs). MAU is responsible for introducing and processing outdoor fresh air, removing particulate matter through primary and medium efficiency filtration, and processing the fresh air to the specified temperature and humidity.
The fresh air treated by MAU is mixed with part of the return air, filtered by FFU and sent to the clean room. After the indoor air is cooled or heated by the dry coil, it is circulated to the return air channel again and mixed with the supplementary fresh air to form a closed-loop air circulation system.
FFU runs continuously to maintain the number of air cycles and ensure the cleanliness of the indoor air; the dry coil adjusts the cold water flow or temperature according to the temperature sensor, and only processes the sensible heat load to avoid mutual interference in temperature and humidity control. This design with clear division of labor improves the overall performance and reliability of the system.
Among the many FFU products, KLC FFU is an excellent choice in the market with its excellent performance and flexible design. KLC FFU uses high-efficiency filters with KLC's exclusive technology, which can achieve high-efficiency air filtration and ensure high cleanliness of indoor air.
Its compact design is easy to install and maintain, and it has the characteristics of low noise and high energy efficiency, which can meet the requirements of different cleanliness levels.
KLC FFU also has flexible installation methods and intelligent control options, which can realize single-unit manual control or multi-unit group monitoring, and can adapt to the needs of clean room applications from small to large scale.
KLC FFU performs well in practical applications, especially in the fields of semiconductor manufacturing, biopharmaceuticals and precision electronic assembly, providing users with efficient and reliable air purification solutions. Its efficient filtering performance and stable airflow organization ability can effectively prevent condensed water from contaminating wafers, ensure the sterile environment of drug production, and ensure the accuracy and stability of the equipment.
KLC FFU's low noise operation and high energy efficiency design also make it perform well in clean rooms with strict environmental requirements, providing users with an ideal air filtration option.
As the core air filtration equipment in the dry coil system, FFU provides a reliable solution for high-cleanliness environments such as clean rooms through its efficient filtering capacity and stable airflow organization. Its collaborative work with dry coils and other components further optimizes the performance and reliability of the system.
In the fields of semiconductor manufacturing, biopharmaceuticals and precision electronic assembly, FFU has become a key equipment for maintaining a high-cleanliness environment to ensure the efficient and stable operation of the production process.
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