What is the initial resistance of a high-efficiency filter?

When selecting a HEPA high-efficiency filter, in addition to filtration efficiency and size, initial resistance is also a parameter that needs attention.

Many customers will ask when purchasing filters:

'What is the resistance of the H13 high-efficiency filter?'

or:

'Does the H14 filter have greater resistance?'

In fact, filter resistance cannot be directly judged based on filtration efficiency levels such as H13 and H14.

The initial resistance of the filter rated air volume, face wind speed, filter material, filter area, filter structure and product design .is related to factors such as

Therefore, the correct selection method is to consider filtration efficiency and resistance together in the entire air treatment system.

1. What is the initial resistance of high-efficiency filter?

Initial resistance refers to is not dusty or in the specified initial state .the pressure loss generated when the air passes through the filter according to specified conditions when the filter

Simple understanding:

Air enters the filter → passes through the filter material → air pressure drops to a certain extent → forming filter resistance

Therefore, the filter is not a 'completely resistance-free' air channel.

The air needs to be filtered through the filter material, which will produce a corresponding pressure loss.

2. In what unit is the resistance of a high-efficiency filter usually expressed?

Filter resistance is typically used:

Pa

to express.

You will usually see the following in product technical parameters:

Things to note are:

Initial resistance must be understood in conjunction with the corresponding test air volume or test conditions.

If you only see a number 'XX Pa' without corresponding test conditions, it is difficult to directly compare between different products.

3. Why might the resistance be different for the same H14?

This is a common problem in high-efficiency filter selection.

because:

H14 is only a filtration efficiency rating and does not fully represent the aerodynamic performance of the filter.

Different H14 filters may exist:

Therefore, even if two products have the same filtration efficiency rating, their initial resistance may be different.

When purchasing, you need to look at the technical parameters of the specific model.

4. The greater the air volume, the greater the resistance of the high-efficiency filter?

With other conditions essentially the same, as the speed of air passing through the filter increases, the pressure loss will usually change.

Therefore, the resistance of the filter cannot be discussed independently of the air volume.

It can be simply understood as:

System air volume changes → Air speed through the filter changes → Pressure loss changes

Therefore, when customers make inquiries, it is best to provide:

Filter size + filtration efficiency + rated air volume

Rather than just offering one filter model.

5. What effect does the filter area have on the initial resistance?

The filter area is one of the important factors affecting the air passage conditions of the filter.

When the system air volume is similar, if the effective filter area is different, the speed of air passing through the filter material will also be different.

Therefore, comprehensive considerations are usually required in the design of high-efficiency filters:

This is why the resistance cannot be judged simply based on the filter's dimensions.

6. Is the resistance of filters with partitions and filters without partitions the same?

uncertain.

Filters with and without partitions use different filter material separation structures, and may have differences in filter pleat form, effective filter area, and product design.

So even with two filters:

Same size + same filtration efficiency

The resistance is not necessarily exactly the same.

Comparisons can be made by specific product parameters:

Therefore, you should not just look at the structure name when selecting a filter.

7. How to judge the resistance of V-shaped high-efficiency filter?

The V-type high-efficiency filter uses multiple filter elements to form a V-shaped structure, which can adapt to the corresponding air treatment needs by increasing the effective filter area.

Its resistance also needs to be combined with:

Filtration efficiency + air volume + filtration area + face air velocity + product structure

Make judgments.

V-type filters are usually used in systems with large air handling capacity, so it is particularly important to confirm when selecting:

Aili Industrial also provides large air volume V-type high-efficiency filter products, and the corresponding specifications can be confirmed according to project parameters.

8. How should the resistance of H13 and H14 be compared?

If you need to compare the resistance of H13 and H14 filters, you can't just look at the product name.

Suppliers should be asked to provide under identical or comparable test conditions .parameters

For example:

Only the data obtained in this way have practical comparative significance.

9. What are the effects of excessive resistance of the high-efficiency filter?

If the filter resistance exceeds the system design conditions, it may affect the operation of the air handling system.

For example:

Filter resistance increases → the fan needs to overcome greater pressure loss → system air volume may change

Therefore, corresponding pressure conditions need to be reserved for the fan during design and selection.

Especially for FFU, EFU and other equipment, if the filter resistance changes, you need to confirm at the same time:

Filter resistance → Fan performance → Working air volume → Working wind speed

There needs to be a match between these parameters.

10. Will the resistance of the filter change after being used for a period of time?

meeting.

As the running time of the filter increases, intercepted particles may gradually accumulate on the surface of the filter material, and the resistance of the filter may change with the operating status.

therefore:

Initial resistance ≠ long-term operating resistance

Initial resistance is the parameter when the product is just installed or specified in its initial state.

During actual operation, maintenance and management also need to be carried out based on the equipment operating conditions and filter status.

For clean rooms and air handling systems, filter inspection and replacement plans can be developed based on actual operating conditions.

11. Why does the filter resistance of FFU need special attention?

The FFU contains fans and high-efficiency filters inside.

Therefore, the filter resistance will directly enter the FFU fan operating conditions.

FFU can be understood as:

Fan → filter → clean air delivery

If the filter resistance changes, the fan operating status also needs to match it.

Therefore, FFU procurement cannot only look at:

'What is the power of the fan?'

Also should read:

Air volume + static pressure/resistance + filtration efficiency + filter size

In this way, the operating conditions of the equipment can be judged more accurately.

12. Why should we pay attention to filter resistance when selecting EFU?

EFU is usually installed on specific production equipment or clean equipment, and equipment space and operating parameters may be limited.

For example:

The equipment space is limited + the filter is thin + a certain amount of air volume is required

At this time, it is necessary to comprehensively consider the filter structure, filter material area and resistance.

Aili Industrial EFU products can be equipped with high-efficiency filters, and some products adopt H14 filtration efficiency, and filters of different specifications can be used according to product configuration.

Therefore, when selecting an EFU project, you should consider:

Equipment size → Filter thickness → Air volume → Filtration efficiency → Resistance → Fan

Think about it together.

13. How does Aili Industry help customers confirm the resistance of high-efficiency filters?

Aili Industrial's high-efficiency filter products cover:

During actual selection, provided by the customer .the filter size, system air volume, filtration efficiency and usage scenarios the corresponding product parameters can be confirmed based on

If it is an FFU or EFU project, it can be further combined with the equipment fan parameters for matching.

14. What resistance parameters should you ask the manufacturer when purchasing a high-efficiency filter?

It is recommended that purchasers do not just ask:

'What is the resistance of this H14?'

You can ask directly:

The information obtained in this way is more complete and makes comparison between products easier.

15. Aili industrial high-efficiency filter selection recommendations

If you are choosing a high-efficiency filter, you can follow this process:

Determine the cleanliness requirements → Determine the filtration efficiency → Determine the system air volume → Determine the filter size → Confirm the initial resistance → Check the fan conditions

If it is a filter replacement project, it is also recommended to provide:

Original filter model + product size + original air volume + original filtration efficiency + equipment model

Aili Industrial can assist in confirming the corresponding filter configuration based on this basic information.

16. Aili industrial high-efficiency filter product consultation

If you are looking for H13, H14 or ULPA filters and are not sure what structure you should choose, you can send the following information to Aili Industries:

Filter size + system air volume + filtration efficiency + equipment used + environment used

If you already have the original product, you can also directly provide product photos and nameplate parameters.

Aili Industry can combine products such as partitioned high-efficiency filters, non-partitioned high-efficiency filters, V-type high-efficiency filters and ULPA ultra-high-efficiency filters for selection, and confirm product parameters based on the actual conditions of FFU, EFU and air treatment systems.

[Get high-efficiency filter selection plan] [Contact Aili Industry]

17. Frequently Asked Questions

Is the lower the initial resistance of a high-efficiency filter, the better?

Don't judge the suitability of a product based solely on initial resistance. Filtration efficiency, air volume, filter area, size and system design also need to be considered simultaneously.

Does the H14 filter have greater resistance than H13?

This cannot be judged directly. The filter materials, structures, filter areas and test air volumes of different products may be different, and comparisons should be made based on specific product test data.

What is the general resistance of a high-efficiency filter?

Different models vary greatly. The specific values ​​are related to the filter structure, size, filtration efficiency and test air volume. The specific product technical parameters should prevail.

Will the resistance increase the longer the filter is used?

The filter will gradually intercept particulate matter during operation, and the resistance may change with the operating status. The specific changes are related to the use environment and filter working conditions.

Does FFU need to readjust the air volume after replacing the high-efficiency filter?

If the resistance, filtration efficiency or size of the new filter is different from the original product, it should be combined with the actual operating parameters of the FFU to confirm whether it needs to be readjusted.

18. Conclusion of the article

The resistance of high-efficiency filter needs to be judged based on actual working conditions.

The initial resistance of a high-efficiency filter is the pressure loss generated when air passes through the filter. It is one of the important parameters in filter selection and air treatment system design.

However, resistance cannot be judged independently from other parameters.

The correct selection logic is:

Filtration efficiency + air volume + filter area + size + initial resistance + fan capacity

For clean rooms, HVAC, FFU, EFU and large air volume air treatment systems, it is necessary to select the corresponding filter according to the actual working conditions.

Aili Industry can the filtration efficiency, size, air volume and equipment information provided by customers.assist in confirming the structure and product parameters of high-efficiency filters based on