What do the chemical filter and particle filter of the air conditioning box deal with respectively?

Particle filters mainly intercept particles in the air, while chemical filters use corresponding media to treat agreed gaseous or molecular pollutants. A high HEPA rating does not mean it will solve all gas problems, nor do chemical filters directly replace the particulate filtration your system requires.

First identify the form of target pollutants

Dust, droplets and gas behave differently in the air, and control requirements should be put forward separately. Process-sensitive projects may focus on both particles and specific molecular contaminants. In this case, division of labor is required, and the particle release and subsequent protection of the chemical medium itself must be evaluated. A reduction in odor cannot be used as proof that all targets are met.

Particle control should check the filter according to particle size, efficiency, air volume and resistance; gas control should check the target object, concentration, temperature and humidity and media adaptation; combined application should check the sequence, mutual protection and overall pressure budget. The three types of tasks correspond to different media and different acceptance methods and cannot be confused. The reason why the clean room still smells after having a high-efficiency filter can be referred toThere is a high-efficiency filter in the clean room, why is there still smell?。

Particle filter solves suspended particles

Particle filters capture suspended particles through interception, inertial collision, diffusion and electrostatic action. Primary-efficiency, medium-efficiency, and high-efficiency filters are classified according to particle size and efficiency, and undertake particle control tasks at different stages. HEPA and ULPA have high capture efficiency for aerosol particles, but have basically no effect on gas molecules. The selection of particle filters is based on particle size distribution, efficiency level, air volume and resistance, and the acceptance method is particle counting or scanning leak detection.

How to configure the junior, middle and high efficiency in different levels, please refer toHow to configure the primary-efficiency and medium-efficiency filters of air-conditioning boxes in different stages? . Whether the high-efficiency filter should be placed inside the machine or at the end, please refer toShould the high-efficiency filter of the air-conditioning box be placed inside the machine or at the end of the air supply? . Particle filtration products can be viewedHEPA/ULPA filter page.

Chemical filters solve gaseous molecular pollution

Chemical filters rely on adsorption or reactive media to treat target gases or vapors such as acidic gases, alkaline gases, organic components and specific molecular contaminants. Its selection is based on target gas, concentration, temperature and humidity, air volume and penetration criteria, and the acceptance method is target gas outlet concentration detection. Chemical filters have limited particle retention capabilities and cannot replace the particle efficiency of HEPA.

For the adsorption and reaction mechanism of chemical filtration, please refer toWhat is the difference between adsorption and chemical reaction in chemical filters? . For the location of the chemical filter section in the air conditioning box, please refer toHow to judge whether the MAU chemical filtration section is arranged before or after the surface cooler? . Chemical filtration products can be viewedChemical Filters Page.

When used in combination, the order and protection relationship must be clear

When the chemical filtration section and the particle filtration section are combined, it is necessary to explain who is in front and who is in the back, and what each protects. Usually particle prefiltration is placed before the chemical section to reduce the deposition of particles on the surface of the chemical media; whether particle filtration is required after the chemical section depends on the release of the chemical medium itself and downstream cleanliness requirements. The structure of chemical first and then particles gives the fine powder released by the medium a chance to be intercepted in the later stage.

Whether the chemical filter material will bring particles to the downstream, please refer toWill chemical filter materials bring particle pollution downstream? . The resistance of the combined filtration will be included in the pressure budget of the whole machine, please refer toWhat functional segments should be included in the internal resistance of the air conditioning box? . Device-side combined applications can understandFFU fan filter unit andThe matching method of the fan filter unit at the EFU equipment end .

Performance commitments should be clearly targeted

Writing 'filtering harmful gases' is too general and cannot form testable conditions. The target object and test method should be clarified, and the initial removal capacity and service life should be explained as different indicators. Under mixed contamination conditions, other components may also affect the performance of the medium, which needs to be evaluated based on actual working conditions.

Similarly, the promise of particle filtration should state the efficiency level, particle size range and test method, not just 'high efficiency'. Chemical filtration commitments should state target gases, inlet concentrations, outlet limits and test conditions. The two types of indicators cannot replace each other, nor can they be summarized by a comprehensive number. For comparison methods of test reports, please refer toHow to compare gas test reports from different chemical filter manufacturers?。

Aili industrial supporting equipment

Aili Industrial can connect particle filtration and chemical filtration at the same time. During consultation, the two types of control objectives are listed separately, which helps to establish a clear division of equipment. Aili Industrial has air filter manufacturing capabilities and can confirm the filter size, grade, installation method and leak detection conditions together with the box structure; the manufacturing end covers independent research and development and production of motors and fans, control systems, sheet metal, air filters and complete machine assembly. The interface, resistance and maintenance space of the particle section and chemical section can be aligned in the same package.

Product form can be viewedAir handling unit andFan box page; particle filtration can be combinedHEPA/ULPA filter confirmation; chemical filtration can be viewedChemical filter solution; clean air supply package can be combinedFFU fan filter unit andthe fan filter unit at the EFU equipment end . Check The specific filtration effect, applicable environment and delivery scope still need to be verified based on the corresponding configuration data and on-site working conditions. Actual results are subject to on-site leak detection, particle testing and gas detection results.

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Related questions and answers

Does a high HEPA rating eliminate the need for a chemical filter?
no. HEPA mainly intercepts particles and has limited effect on gas molecules. Control of gaseous pollution requires chemical filtration or other specialized measures.

Can chemical filters replace particulate filters?
cannot. Chemical filters mainly deal with gaseous molecular pollution and have limited ability to intercept particles. The particle filtration required by the system still needs to be configured separately.

Can Aili Industrial provide both particle and chemical filtration packages?
Two types of products can be connected at the same time. The particle and gas control targets are listed separately during consultation. The specific configuration needs to be confirmed based on the project conditions.

Related articles

1. There is a high-efficiency filter in the clean room, why is there still smell?

2. How to configure the primary-efficiency and medium-efficiency filters of air-conditioning boxes in different stages?

3. Will chemical filter materials bring particle pollution downstream?

4. How to judge whether the MAU chemical filtration section is arranged before or after the surface cooler?

Key points for selection and acceptance inspection