The MAU chemical filtration section needs to be considered together with the entrance rainproofing and related structures. The rainproof louvers can undertake part of the entrance protection task, but cannot alone guarantee that all rainwater or droplets are blocked. The filter material still needs to meet the actual inlet environment. Louvers are part of the entrance protection, not the whole thing.

What can and cannot be blocked by rainproof blinds?

The design goal of rainproof louvers is to prevent direct entry of rainwater under normal wind speed and direction conditions. It has a good blocking effect on vertical falling or oblique rainwater, but its blocking ability against strong wind and rain, fine mist droplets and long-term high-humidity air is limited. When the louver blades are deformed due to dust accumulation, the drainage holes are blocked, or the installation angle is incorrect, the protective effect will be reduced. Therefore, the louvers can reduce the probability of droplets entering, but they cannot be used as the only basis for waterproofing the filter section. The location of the filter section and the drainage structure of the box still need to be considered separately.

The chemical filter section requires a stable inlet environment

Chemical filter materials have a certain scope of application for humidity. Direct contact with droplets and continuous high humidity are two different effects. The former is more direct, and the latter is slower. Rainproof louvers mainly deal with the former and have limited effect on the latter. If the MAU installation area has a long rainy season and high air humidity, even if there are louvers, the local humidity at the filter section may still exceed the applicable range of the medium. At this time, you need to consider the box insulation, airflow organization or filter section position adjustment, instead of just relying on the louvers. Regarding the impact of high humidity on filter elements, please refer toDo chemical filter inspection intervals need to be shortened during high-humidity seasons?。

Entrance protection should be layered

Relatively reliable entrance protection is not a single measure, but the coordination of several structures. The louvers block most of the rainwater, and a water baffle or water removal structure can be installed behind it to deal with the leaked droplets. A drainage system is installed at the bottom of the box to drain away accumulated water in a timely manner, and sufficient air-water separation distance is maintained in front of the filter section. The chemical filter section itself does not have a water-blocking function, and its location should avoid areas where droplets can easily reach. If space is limited and it is impossible to set up a complete level, priority should be given to ensuring water retention and drainage in front of the filter section, and then considering the form of louvers. For issues related to the layout of outdoor air inlet boxes, please refer toCan the MAU chemical filter be placed in the outdoor air inlet box?。

In renovation projects, it is necessary to check whether the original protection is retained.

When a chemical filter section is installed on an existing MAU, the original inlet protection structure may be modified due to space adjustment. If the new filter section occupies the location of the original baffle or drainage structure, the inlet protection layer will be broken and the risk of droplets will increase. The modification plan should confirm the relationship between the louvers, water retaining, drainage and filter section positions, and should not just focus on whether the filter element can be placed. 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?。

Aili industrial supporting equipment

For issues such as MAU inlet protection, our suggestion is to first look at the louvers, water retaining, drainage and filter section positions as a set of structures, and then confirm the actual inlet environment faced by the filter material. 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 velocity, but the inlet water blocking and drainage still need to be configured according to site conditions. Device-side applications can useChemical filter FFU type, integrated chemical adsorption layer withHEPA/ULPA filter particle filtration. The manufacturing end covers independent R&D and production of motors and fans, control systems, sheet metal and complete machine assembly. The positions of inlet louvers, box drainage and filter sections can be checked in the same package, and non-standard boxes can be adjusted according to on-site space. The specific gas effect, environmental suitability 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

With rainproof louvers installed, will the chemical filter section not be affected by moisture?
Not guaranteed. Strong wind and rain, louver deformation and drainage blockage may allow droplets to enter. Water retaining or water removal structures are usually required, and drainage status must be checked regularly.

Is there any distance needed between the louvers and the filter section?
It is recommended to leave space for gas-water separation and maintenance. When the distance is insufficient, it is easier for droplets to reach the filter section, making inspection and replacement inconvenient. The specific distance should be determined based on the wind speed and box structure.

Can Aili Industrial help check the entrance protection configuration?
The louver form, box drainage and filter section position can be combined to help check the entrance protection level. 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