Can an ordinary factory building become a clean workshop by installing FFU?

Ordinary factories usually do not have airtight enclosures, controlled air supply and return, and no personnel and material purification processes. Installing FFU under such conditions can improve the air near the air outlet, but it cannot automatically make the entire factory reach a certain cleanliness level.

What FFU provides is filtered air supply, which requires the cooperation of enclosure sealing, air return and return paths, personnel and material management, and appropriate air conditioning conditions to form an effective purification cycle. Let’s start with several practical aspects.

Equipment capabilities work together with room conditions

The FFU itself can filter the air, but the room conditions determine whether the filtered air can be held. Open doors and windows, uncontrolled air intake, frequent personnel entry and exit, and high dust-producing processes continue to introduce particles into the room.

If the source of air upstream of the FFU is unclear, or the return air channel is blocked by equipment or shelves, repeated inhalation of contamination or local short circuits may occur. The total air volume seems to be sufficient, but key workstations are still not effectively protected. At this time, you need to check the airflow path first instead of continuing to increase the number of FFU.

If you are not sure whether to renovate the entire room or just a part of it, you can first look at How to choose between whole room purification and partial purification ? Clarify the selection logic at the program level, and then determine which route is suitable for ordinary factories.

First compare the whole room renovation and partial solutions

The overall transformation of an ordinary factory building into a clean workshop involves the building envelope, air conditioning system, air supply and return ducts, pressure difference control, and personnel and material passages. The project volume is large and the cycle is long. If the factory conditions are difficult to control as a whole, local solutions can be evaluated, such as clean sheds, purification in equipment covers, or local FFU protection of necessary workstations.

The clean workbench comes with its own air supply and enclosure, which is suitable for workstations with concentrated operating areas. However, the scope of protection is limited, and products still need other protection when being transported outside the workbench. This point is Can a clean workbench replace an entire clean room? There are more detailed instructions here.

Regardless of whether you choose a whole-room renovation or a partial solution, you must clearly define the applicable boundaries, maintenance requirements, and actual acceptance locations. Do not regard partial air outlet qualification as compliance with the entire factory.

Enclosure sealing and return air path

The doors, windows, gaps and openings of ordinary factory buildings are the main channels for particle input. If the enclosure is not sealed, the air filtered by the FFU will continue to be diluted by background pollution, making it difficult to maintain a stable level.

The return air path is equally critical. If there is only supply air but no reasonable return air, the air flow will be stagnant or discharged from the gaps in an orderly manner; if the return air is blocked or the supply air is short-circuited, there will be insufficient air volume in some areas. It is necessary to check the location of the return air outlet, whether the return air channel is clear, and whether supplementary air is needed to balance the exhaust air.

If the project is constructed in phases or requires independent modules, please refer to What are the expansion conditions for using independent modules in clean systems? , reserve allowances for power distribution, communications, structural loads and wind paths in advance.

Personnel material management and pollution input

The clean workshop is not just air equipment, but also includes personnel changing clothes, material cleaning, turnover container management and door opening frequency control. If these inputs are not managed, FFU filtering alone will have limited effectiveness.

It is recommended to mark personnel entrances, material entrances and high dust-producing processes on the floor plan, and check whether they are located upstream of the protected area. If necessary, adjust logistics routes or increase local isolation instead of blindly increasing the number of air changes in the entire room.

Equipment selection and applicable boundaries

When installing FFU, check the working point with filter, external static pressure, installation dimensions, sealing method and maintenance direction. Please refer to the room background air supply FFU clean air supply products , please refer to the local protection of the equipment side. EFU equipment side fan filter unit . The logic of division of labor between the two lies in The division of labor between device-side EFU and room FFU is explained in detail.

Filter selection should correspond to target particle size and actual resistance.The HEPA and ULPA filter pages have parameters for different levels of products. When selecting, check the efficiency of the specific model at the target air volume.

If zone duty and troubleshooting are required, they can be combined FFU group control system provides unified management.

Project judgment example

A batch of FFUs were added to a warehouse, and the air near the air outlet was significantly improved, but the warehouse as a whole still had a large amount of particles input. The reason is that the warehouse doors and windows are frequently opened, and the return air channel is blocked by the goods, so the air flow cannot form an effective circulation. Adjustment method: delineate local verifiable clean areas and increase enclosures and return air paths instead of claiming that the entire warehouse reaches level 100.

In another project, there was only one assembly line in an ordinary factory that needed to be protected, and the overall renovation budget was too high. The plan is to set up a partial clean shed above the assembly line, with FFU air supply and side curtains to reduce interference. After installation, local areas are tested to confirm that product protection requirements are met, and the cleanliness level of the entire factory is not declared.

These two situations illustrate that the installation of FFU in an ordinary factory can only improve the local air and cannot automatically become a clean workshop of a certain level. It is necessary to choose the whole room renovation or partial plan according to the actual goals, and clearly define the acceptance boundaries.

Key points for selection and acceptance inspection

Aili industrial equipment supporting support

Aili Industry covers motor manufacturing, independent research and development and production of fans, control system development, sheet metal processing, air filter manufacturing and complete machine assembly. For FFU installation projects in ordinary factories, FFU, EFU, HEPA/ULPA filters, group control systems, air volume, static pressure, and installation interfaces can be uniformly checked to connect equipment configuration with on-site evaluation boundaries and reduce the disconnect between component parameters and complete machine operating conditions.

learn FFU clean air supply products；EFU equipment side fan filter unit；HEPA and ULPA filters；FFU group control system checks the installation space, operating conditions and filtered air supply configuration.

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