How to choose small size EFU with ULPA? Air volume, space and dust holding conditions

small sizeEFU equipment side fan filter unit configurationFor ULPA filters , you should first determine the required air volume in the process area, and then check the filter element area, resistance, fan residual pressure and maintenance space. Small size does not mean dust holding and pre-filtration can be ignored. When the internal space of the equipment is compact, the filter element area, surface wind speed and fan residual pressure are more likely to squeeze each other, so they should be looked at together when selecting. Aili Industrial also providesSmall size EFU equipment fan filter unit withHEPA/ULPA filter can check the working point of the whole machine in the same project.

1. Correspond air volume to filter area

Distinguish between the outer frame area and the effective air outlet area, and use the same unit when calculating the target surface wind speed. When space is small, increasing wind speed may increase drag and affect uniformity.

The air volume requirement of small-sized EFU is not high, but the filter element area is also small, and the face air velocity is easily pushed up. The increase in face wind speed will lead to an increase in resistance and a decrease in dust holding capacity.Non-standard ULPA filters can evaluate the adjustment space of pleated structure and effective area when the size is limited. The relationship between levels and filtering requirements can be found inISO cleanliness level comparison。

2. Check the working point of the whole machine. Don’t just look at the free air supply volume of the fan.

Calculate the available pressure based on the air inlet, fan and equipment air duct, and then look at the ULPA resistance curve. The capacity of the complete machine cannot be judged solely by the free air supply volume of the fan.

The free air supply volume is the maximum value under no resistance. After being installed in the EFU box and equipped with ULPA, the actual working point will be significantly shifted. Ai Li industrialThe EFU equipment-end fan filter unit supports calculating working points based on machine back pressure and target air volume.The small-sized EFU equipment fan filter unit can determine the air outlet pattern in combination with the cavity structure. For questions about matching the EFU working point and resistance, please refer toEFU FAQ and technical support。

3. Evaluate usage and replacement conditions

Check the upstream dust collection and pre-filtration arrangements, and reserve space for filter element replacement, seal inspection and leak detection. The prototype needs to be confirmed in the actual interface status.

The replacement space of small-sized EFU is inherently tight. If the pre-filtration configuration is insufficient, the ULPA resistance will rise faster and the replacement frequency will also increase. Aili Industry isIn the HEPA/ULPA filter selection stage, suggestions can be given based on dust holding and pre-filtration conditions.The structure of non-standard ULPA filters can be confirmed according to the net size of the cavity. Please refer to the key points for checking the maintenance space inside the equipment.EFU FAQ and technical support。

4. Recheck the ultra-thin EFU filter element when replacing it with a higher grade filter element.

Can ultra-thin EFU be directly replaced with a higher grade filter element? The resistance, air volume, sealing and testing conditions need to be rechecked and cannot be determined solely based on appearance compatibility.

An increase in level is usually accompanied by an increase in resistance. The residual pressure of a small-sized EFU fan is inherently limited, and the air volume may be insufficient after core replacement. The sealing method and leak detection conditions must also be confirmed together. For differences in sealing structures, please refer toHEPA FAQs and Selection Guide。

5. Related questions and answers

Can ultra-thin EFU be directly replaced with a higher grade filter element?
The resistance, air volume, sealing and testing conditions need to be rechecked and cannot be determined solely based on appearance compatibility. Small size models have limited residual pressure, so the working point should be checked according to the target air volume before core replacement.

Small size EFU is equipped with ULPA. Is the larger the air volume the better?
no. The air volume should match the filter element area and fan residual pressure. Too high wind speed will increase resistance and noise, and shorten the dust holding period.

Is pre-filtration important for small size EFU?
important. When the pre-filtration configuration is insufficient, the ULPA resistance rises faster, the frequency of replacement increases, and the maintenance space of small-size models is limited, so the replacement cost will be higher.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

HEPA FAQs and Selection Guide

EFU FAQ and technical support

ISO cleanliness level comparison

7. Key points for selection and acceptance inspection

8. Product matching and technical support from Aili Industrial

Ai Li industrialThe EFU equipment-side fan filter unit covers different box sizes and fan configurations.The small size EFU equipment fan filter unit is suitable for equipment interior scenarios with limited space and can be used withHEPA/ULPA filter confirms the operating point of the whole machine. Ceiling scenes can be combinedDiscussion on FFU fan filter unit , non-standard sizes are availableCustomized non-standard ULPA filters . Provide process objectives, installation drawings, operating conditions and acceptance requirements for further communicationULPA ultra-high efficiency filters . Standard specifications, non-standard interfaces, samples and batch matching of The specific parameters and test range are based on the confirmed model and technical documents.