What parameters need to be determined first when selecting FFU?

Direct answer: FFU selection should first determine the application area, cleanliness target, target air volume or face velocity, and installation size . On this basis, determine the static pressure, filter configuration, power supply, speed regulation and control method corresponding to the target air volume. Just giving the manufacturer an external dimension or 'how much air volume is required' is usually not enough to complete the matching of the whole machine.

Step 1: Determine cleaning goals and air supply tasks

In the same project, clean room ceilings, equipment tops and local process areas may have different cleaning requirements. It should first be clear where the FFU is installed, which process it serves, what the target cleanliness level is, and whether personnel and equipment activities will change particle control needs.

This information determines how the designer determines the air supply range and airflow organization. The cleanliness level itself cannot be directly converted to the model or quantity of a certain FFU ; it also needs to be combined with the area size, equipment layout, air return path and project design requirements.

Step 2: Determine the target air volume and static pressure together

The target air volume or face velocity is the starting point for selection, and the static pressure is related to whether the FFU can maintain the air supply volume under the filter and on-site resistance. When making a request to the manufacturer, it should be written as 'At the target air volume ____m³/h, check the required static pressure ____Pa according to the agreed configuration', and indicate the value that has yet to be confirmed by the design.

When comparing product data, you should confirm whether the air volume, static pressure and power come from the same rotation speed, the same filter configuration and the same test conditions . If the maximum air volume and maximum static pressure correspond to different operating points, they cannot be directly combined into design parameters.

Step Three: Clarify Filters and Installation Boundaries

The filter needs to determine HEPA or ULPA requirements based on the cleanliness target, and check its resistance, size, sealing and replacement method under the target air volume. chooseWhen using HEPA/ULPA filters , if the efficiency level is improved or the structure is changed, the fan operating point of the FFU should be checked simultaneously.

In terms of installation, at least the ceiling module or equipment opening size, allowable box height, air inlet space and maintenance direction must be provided. For non-standard projects, peripheral beams, lighting fixtures, pipelines and electrical wiring locations should also be provided to avoid equipment that meets the requirements but cannot be installed or maintained.

Step 4: Determine operational and control requirements

Power supply conditions, continuous running time, speed regulation range, work and duty modes, as well as single machine control or multiple zone control, should be explained in the selection stage. For multiple FFU projects, communication interfaces, device addresses, number of partitions, and expansion requirements must also be planned. Control requirements can be combinedAili Industrial FFU centralized control system is further discussed.

If the project needs to calculate operating expenses, the manufacturer should be required to provide input power data under the target air volume and agreed filter configuration; the rated power cannot directly represent the actual power consumption in all operating modes.

A concise selection information for manufacturers

For projects that do not have final values, design goals and on-site drawings can be provided, and 'pending technical solution confirmation' will be noted. The key is to let manufacturers know which conditions have been fixed and which still need to be jointly verified.

How does Aili Industry cooperate with project selection?

Aili Industrial develops and produces motors, fans, control systems, sheet metal structures and filters in-house. For standard ceiling or non-standard equipment requirements, we can discuss the target air volume, filter resistance, installation height and control method.The entire FFU machine is configured so that each parameter corresponds to the same project working conditions.

The specific model, performance and acceptance method shall be subject to the project technical agreement and the prototype, complete machine or on-site test results under agreed working conditions.