What should I do if the ULPA air outlet is blocked by equipment or lamps? Airflow organization rectification

If the air outlet of the ULPA filter is blocked by equipment or lamps, the impact of the blockage on the air flow and maintenance testing in the process area should be evaluated. The results cannot be estimated based only on the proportion of the blocked area, nor can the remaining air volume be automatically compensated by default. The obstruction below the air supply surface will change the direction of the local airflow: the airflow will detour after hitting the obstacle, forming a low-speed area and wake downstream of the obstacle. If the protected object happens to be located in the wake area, even if the total air volume does not change, local protection may be insufficient. The impact of occlusion depends on the position, size and relative relationship between the obstacle and the protected object, and cannot be simply estimated by area. Aili Industry isFFU fan filter unit andWhen matching the fan filter unit at the EFU equipment end, check the distribution of the air supply surface according to the equipment layout and the position of the lamps.The FFU computer group control system records the air volume and operating status of the partitions. When obstruction occurs, the scope of influence can be evaluated based on the air supply layout.

1. Mark obstacles and protection points: location, size and relative relationship

Record the location, size, height and equipment working status, and pay attention to whether sensitive workstations fall in the wake or backflow area.

The impact of occlusion must first be clearly drawn: where is the obstacle below the air supply surface, how far away from the protected object is it, what is its height, and whether it moves with the movement of the equipment. When the obstacle is directly under the air supply surface, the impact is direct; when it is at the edge of the air supply surface, the impact range may be limited; if the obstacle is close to the protected object, the wake may directly cover the protection point; if it is far away, the impact may be diluted by subsequent airflow mixing. Aili Industry isIn the HEPA/ULPA filter matching plan, the locations of the air supply surface and protection points are marked according to the equipment layout.The non-standard ULPA filter project can confirm the relative relationship between obstacles and air supply surface according to the equipment structure. The relationship between grade and airflow requirements can be found inISO cleanliness level comparison。

2. More feasible rectification plans: lamps, equipment, module layout or partial protection

Lamps, equipment height, filter module layout or local protection methods can be adjusted, but lighting, operation and other interface requirements need to be checked at the same time.

There are several directions for rectification: move the lamps to a position that does not affect the air supply surface, adjust the height or position of the equipment to allow airflow to bypass it, rearrange the filter modules so that the air supply surface covers the protection points, and add local protection at key workstations. Every solution has a price: moving lamps may affect the illumination distribution, adjusting the position of the equipment may affect the operation process, and rearranging modules is limited by ceiling space. Aili Industry isIn the FFU fan filter unit package, the module arrangement can be adjusted according to the equipment layout.The EFU equipment-side fan filter unit equipment-side solution can increase local air supply at key workstations.Ultra-thin EFU provides local protection solutions when the internal space of the device is limited. For comparison of rectification plans, please refer toHEPA FAQs and Selection Guide。

3. Verify the corrected air path: wind speed distribution and necessary flow pattern

Detect relevant wind speed distribution and necessary flow patterns, check adjacent areas, and confirm that the leak detection and core replacement channels are not blocked by the new structure.

After the rectification, three things need to be confirmed: whether the wind speed and air flow direction at the protection point have been restored, whether the adjacent area has been affected by the adjustment, and whether the new structure blocks the leak detection probe or the filter element replacement channel. Aili Industry isIn the ULPA ultra-high-efficiency filter leak detection plan, the operating conditions of the probe are explained according to the coverage of the filter surface and sealing surface.The FFU fan filter unit complete machine test records the regional air volume and distribution. After rectification, the effect can be confirmed by comparing the test data;The FFU computer group control system records the operating parameters before and after adjustment. For methods of rectification and verification, please refer toULPA ultra-high efficiency filter FAQ and selection guide。

4. After adding large-sized lamps below the filter surface, even if the average air supply volume does not change, the downstream protection must be checked.

After adding a large-sized lamp below the filter surface, even if the average air supply volume does not change, the process protection downstream of the lamp should be checked. The lamp will change the direction of the local air flow, and a low-speed area or wake may be formed downstream. The scope of the influence is related to the size and installation height of the lamp.

Aili Industry isNon-standard ULPA filters andWhen matching the FFU fan filter unit , evaluate the impact of the air supply surface according to the position and size of the lamps. If necessary, adjust the module arrangement or the position of the lamps to allow the airflow to bypass obstacles and reach the protection point. Please refer to the coordination of lighting and air supply layout.HEPA FAQs and Selection Guide。

5. Related questions and answers

Can increasing the wind speed of other modules compensate?
Whether it is effective or not needs to be verified in combination with air flow. It cannot be considered that local problems have been eliminated just by making up the total air volume.

The blocked area is not large, can it be ignored?
uncertain. The impact of occlusion depends on the relationship between the position and the protected object. If a small block of occlusion is directly facing the protection point, the impact may be obvious.

Do adjacent areas need to be inspected after rectification?
need. Adjusting module arrangement or air supply direction may affect adjacent areas, and should be reviewed based on the scope of impact.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

Ultra-thin EFU

FFU computer group control system

HEPA FAQs and Selection Guide

7. Key points for selection and acceptance inspection

8. Product matching and technical support from Aili Industrial

Aili Industry isFFU fan filter unit andWhen matching the fan filter unit at the EFU equipment end, check the distribution of the air supply surface according to the equipment layout and the position of the lamps.The FFU computer group control system records the air volume and operating status of the partitions. When obstruction occurs, the scope of influence can be evaluated based on the air supply layout.The HEPA/ULPA filter matching plan marks the locations of the air supply surface and protection points according to the equipment layout.The non-standard ULPA filter project confirms the relative relationship between obstacles and air supply surface according to the equipment structure;The FFU fan filter unit is equipped with a module arrangement that can be adjusted according to the equipment layout.The EFU equipment-side fan filter unit equipment-side solution can increase local air supply at key workstations.Ultra-thin EFU provides local protection solutions when the internal space of the device is limited.ULPA ultra-high efficiency filter leak detection solution explains the operating conditions of the probe,The FFU fan filter unit complete machine test records the partition air volume and distribution. After rectification, the effect can be confirmed by comparing with the test data.The FFU computer group control system records the operating parameters before and after adjustment. Provide process objectives, installation drawings, operating conditions and acceptance requirements, and can further communicate ULPA standard specifications, non-standard interfaces, samples and batch matching. The specific parameters and test range are based on the confirmed model and technical documents.