How to match the air volume and static pressure of ISO 5 clean room FFU?
Direct answer: ISO 5 is the cleanliness level of the concentration of suspended particles in the air and cannot be directly converted into a fixed FFU air volume or static pressure. The project should first determine the target air volume based on the process, air supply range and air flow organization, and then check whether the FFU can overcome the actual resistance at this air volume after installing the specified filter. Finally, it should be verified through on-site air flow and particle concentration tests.
According to ISO 14644-1, cleanliness levels are classified according to the concentration of particles in the air. Therefore, 'Using an ISO 5 Clean Room' explains the cleanliness goals that need to be achieved, but does not give each unit individually.The air volume that the FFU fan filter unit should provide. Air volume must still be determined by clean room design and process conditions.
First clarify what ISO 5 requirements cover
The project should indicate whether the entire room reaches ISO 5, or a local clean area near the process equipment reaches ISO 5, and the operating status at the time of acceptance should be specified. The FFU layout and regional air volume distribution may be different in the two cases.
Equipment location, personnel activity, dust generation, return air paths, and airflow directions in critical work areas should also be checked. Only using the room area or the maximum air volume of a single FFU to calculate the air supply configuration cannot explain whether particles can be effectively taken away from key areas.
Match static pressure at target air volume
After determining the target air volume of a single FFU, you should check the fan performance corresponding to the air volume and clarify the test location and conditions for static pressure data. assemblyAfter HEPA or ULPA filter , the filter resistance will affect the FFU working point; the related structural resistance of the ceiling or equipment end should also be included in the check.
If the supplier provides data for a complete machine equipped with a specified filter, it should be confirmed whether the filter resistance is included in the test results to avoid double counting. The 'maximum air volume' and 'maximum static pressure' in the product information may come from different operating points and cannot be combined into the same ISO 5 design condition.
Resistance may change after filter operation. The project should also agree on air volume review and maintenance conditions to confirm that the FFU can maintain the target air supply during normal operation, not just with new filters.
The cleanliness level is confirmed by on-site results
Matching air volume and static pressure is an equipment condition for achieving the ISO 5 goal, but it is not everything for cleanliness acceptance. The air supply volume, wind speed distribution, air flow in key areas and particle concentration also need to be checked on site. The test plan should indicate whether the clean room is built, static or operating; ISO 14644-3 provides clean room performance testing methods for different airflow types and these operating states.
Aili Industrial can match FFU's fans, motors, filters and control solutions based on ISO 5 regional scope, target air volume, filtration requirements, ceiling or equipment installation conditions. For batch projects, it is recommended to first use a prototype to confirm the operating point of the whole machine under the target air volume, and then write the filter configuration, test conditions and on-site acceptance methods into the technical agreement. Specific performance and cleanliness are subject to test results under project working conditions.
The most critical information during project communication: ISO 5 required area coverage and acceptance operation status, single FFU target air volume, designated filter, known resistance, and airflow requirements at key locations. Only after these conditions are clarified can we have a basis to compare the air volume and static pressure of FFU.
