The chemical filtration section of the air-conditioning box prevents condensed water from contacting the filter material. It is necessary to check the filter position, surface cooler drainage, droplet entrainment and condensation conditions. Chemical filters should not be used in place of water retaining or water removal structures. Most moisture problems are not caused by the filter material itself, but the consequences are often borne by the filter material.

First find out where the moisture comes from

The moisture in the air conditioning box comes from more than one source. Poor drainage of condensate water from the surface cooler, overflow of the water pan, insufficient water baffle efficiency leading to droplet entrainment, insufficient absorption of steam in the humidification section, condensation of the cold bridge in the box, and retention of high-humidity air in the box during shutdown may all cause the filter section to become damp. Different sources have different treatment methods: for drainage problems, repair the water pan and pipes, for entrainment problems, check the water baffle and wind speed, and for condensation problems, check the insulation and box sealing. Simply replacing the moisture-resistant filter material or thickening the media without locating the source first usually cannot solve the underlying problem.

The location of the filter section should avoid high humidity areas

The position of the chemical filter section in the air conditioning box directly affects the state of the air it comes into contact with. If it is close to the air outlet side of the surface cooler, too close to the downstream of the humidification section, or in a dead corner of the air flow, the local humidity may be significantly higher than the average level of the box. In most scenarios, the chemical filter section should be arranged after the surface cooler, before the humidification section, or at a sufficient distance from the high-humidity area, and ensure that the airflow speed and temperature and humidity at this location fall within the applicable range of the medium. For issues related to the layout near the humidification section, please refer toWhat happens if the air conditioning box chemical filter is close to the steam humidifier?。

Water retaining and drainage structures cannot be omitted

Chemical filters are not water retainers and cannot be used to intercept droplets. A water baffle or water removal structure should be retained behind the surface cooler, the drainage from the water pan should be smooth, and there should be no water accumulation at the bottom of the box. If the water baffle is removed due to tight space, the droplets will directly enter the filter section. When the medium becomes damp, the capacity will decrease, the resistance will increase, and the structure will even deform. If the renovation project involves adjusting the position of the filter section, you should first confirm whether the original water retaining and drainage structures are retained and effective before discussing the filter element configuration. Regarding the choice of functional sections in the modification of air-conditioning boxes, please refer toCan the MAU chemical filter directly replace the original medium efficiency filter?。

Start-stop and seasonal changes should be included in the inspection

Condensation water problems often occur during start-up, shutdown and seasonal changes. In the early stage of startup, the surface temperature of the surface cooler is low and the air volume is not stable, which is prone to short-term droplet entrainment. After shutdown, the humidity in the box rises. If the filter section is in a closed high-humidity environment for a long time, it may also become damp. In terms of inspection arrangements, the appearance and drainage status of the filter section can be inspected during the rainy season and frequent start-stop periods, and the temperature and humidity before and after the filter section can be recorded. For maintenance rhythm related to high humidity season, please refer toDo chemical filter inspection intervals need to be shortened during high-humidity seasons?。

Aili industrial supporting equipment

The chemical filter section of the air-conditioning box is affected by moisture. Our suggestion is usually to check the source of the moisture first and then talk about the filter element. Aili Industry can provide selection packages for box-type, flat-plate and V-type chemical filtration products. For box-type MAU packages, please refer toMAU box type chemical filter , product series can be viewedChemical filter product range . The V-shaped structure provides a larger filtration area in the same box space, which helps reduce surface speed, but it still has the same requirements for water retaining and drainage structures. Equipment-side applications can adopt the form of chemical filtration FFU, integrating chemical adsorption layer and HEPA/ULPA particle filtration. The manufacturing end covers motors, fans, control systems, sheet metal and complete machine assembly. The filter section position, box sealing and drainage structure and fan operating conditions can be checked together during the matching stage. Non-standard cabinets and interfaces can be adjusted according to on-site space. The specific gas effect, applicable environment and replacement cycle still need to be verified based on the corresponding configuration data and on-site working conditions. The actual results are subject to on-site leak detection and gas detection results.

Related questions and answers

Can the filter material still be used after it gets wet?
Should be confirmed according to the product description. Moisture may change the status and capacity of the media. Normal appearance does not mean that performance is not affected. It is recommended to check the filter section environment and verify the outlet gas before making a decision.

Will adding a water baffle increase the resistance?
The water baffle will add a certain amount of resistance, but compared with the increase in resistance and decrease in capacity caused by droplets entering the filter section, it is usually more controllable. It should be considered together in the calculation of the resistance of the whole machine.

Can Aili Industrial help check the location of the filter section?
The layout of the filter section can be checked based on the structure of the air conditioning box, the position of the surface cooling and humidification sections, air volume, and temperature and humidity conditions. The specific plan needs to be confirmed based on product data and on-site working conditions.

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Key points for selection and acceptance inspection