What are the differences between ultra-low resistance filters and high-efficiency exhaust units?

The differences between ultra-low resistance filters and high-efficiency exhaust units are as follows:
Functionally
Ultra-low resistance filters Its main function is to filter air, effectively intercepting dust particles, microorganisms, and other impurities in the air. It features low resistance, allowing air to pass through with minimal pressure loss during filtration, ensuring the smooth operation of the ventilation system and achieving a better air purification effect. It is widely used in places where there are certain requirements for air purification and energy conservation needs to be considered Such as clean air conditioning systems, etc.
High-efficiency exhaust unit: In addition to having a filtering function, it also undertakes the task of expelling indoor air to the outside, and is more focused on achieving organized and efficient exhaust. In some places with strict requirements for biosafety and environmental control, such as biosafety laboratories and negative pressure isolation wards in infectious disease hospitals, high-efficiency exhaust units can ensure that the indoor air containing harmful biological aerosols and pollutants is safely discharged outdoors after high-efficiency filtration, preventing pollution to the external environment.
In terms of structural composition
Ultra-low resistance filter: It is usually composed of a frame and filter materials. The frame is generally made of materials such as aluminum alloy and galvanized sheet, which serve to support and fix. The filter materials are mostly glass fibers, synthetic fibers, etc., which are made through special processing techniques to achieve the performance of low resistance and high-efficiency filtration.
High-efficiency exhaust unit: Its structure is relatively complex, generally including a box body, high-efficiency filters, exhaust fans, control systems, and related sealing devices, etc. The box body is used to accommodate various components and provide a closed space. The high-efficiency filter is the core component, responsible for precisely filtering the exhaust air. The exhaust fan provides the exhaust power to ensure that the indoor air can be extracted in time. The control system is used to monitor and control the operating status of the exhaust unit, such as the rotational speed of the fan and the resistance of the filter, etc. The sealing device ensures that the entire unit will not leak during operation, preventing harmful gases from leaking into the surrounding environment.
In terms of application scenarios
Ultra-low resistance filters: Commonly found in places where there are certain requirements for air cleanliness and at the same time, it is hoped to reduce the energy consumption of ventilation systems, such as clean workshops in electronic factories, general production areas in pharmaceutical factories, and air conditioning systems in high-end office buildings, etc. These places need to filter out dust and other impurities in the air to meet the requirements of production processes or personnel comfort. The low resistance feature of ultra-low resistance filters can reduce the energy consumption of fans and achieve the purpose of energy conservation.
High-efficiency exhaust units: Mainly applied in places with extremely high requirements for biosafety and environmental protection, such as the protected areas of biosafety laboratories, negative pressure wards in infectious disease hospitals, and some special industrial production workshops (such as workshops that produce harmful gases or dust during the production process). In these places, the polluted indoor air needs to be strictly filtered and safely discharged to prevent the spread of harmful organisms or pollutants to the outside, protecting the safety of the surrounding environment and people.
In terms of performance parameters
Ultra-low resistance filter: The main performance parameters include filtration efficiency, resistance, dust holding capacity, etc. Its filtration efficiency usually reaches the medium-high efficiency or high-efficiency level, and it has a high removal rate for dust particles of different sizes. The resistance is relatively low, generally ranging from tens to hundreds of pascals. The specific value depends on factors such as the type of filter and air volume. The dust holding capacity indicates the amount of dust that a filter can hold before reaching a specified resistance increase. The greater the dust-holding capacity, the longer the service life of the filter.
High-efficiency exhaust unit: In addition to parameters such as filtration efficiency and resistance, it is also necessary to pay attention to parameters such as exhaust volume, fan power, and the sealing performance of the box. Exhaust volume refers to the volume of air that can be discharged within a unit of time. According to different application scenarios and room sizes, it is necessary to select an exhaust unit with an appropriate exhaust volume. The power of the fan is related to the exhaust volume and system resistance. The greater the power, the stronger the exhaust capacity, but at the same time, the higher the energy consumption. The sealing performance of the box is usually measured by indicators such as leakage rate. It is required that under a certain pressure, the leakage amount be controlled at an extremely low level to ensure the safety of exhaust.