What type of air conditioning box is the V-type high-efficiency filter suitable for?

V-type filters are used a lot in air conditioning boxes, but they are not suitable for all filter segments. Judging whether it can be used depends on whether the air conditioner box gives you enough space and conditions.

The characteristic of the V-shaped structure is that a large filter material area is arranged within a limited cross-section. This feature is suitable for occasions with large air volume and limited installation cross-section. But whether it can be installed and whether the system can hold it after installation depends on several conditions. Please refer to the specific product structure V-type high-efficiency filter . Description of

First confirm the real space of the filter segment

Installation dimensions are the first thing to check.

Installation cross-section : The size of the windward side of the V-shaped filter element should correspond to the installation frame of the filter section. When measuring, measure the inner opening size of the installation frame, not the outer size of the old filter element.

Cabinet depth : V-shaped structure requires a certain installation depth. Measure the distance from the installation surface to the rear structural member of the filter section to confirm that the V-shaped filter element can be completely installed.

Access door and extraction direction : Check the opening size of the access door to confirm that the filter element can pass through completely. The access doors of some air conditioning boxes are too small, and the V-shaped filter element cannot be taken out even if there is enough space in the box.

The same installation area does not mean that the depth and rated air volume of all V-shaped products are the same. The pleat angles and filter media areas of different products may be different. When selecting, confirm the specific dimensions with the supplier.

Calculate total resistance

Select the product according to the designed air volume of the air conditioning box, and then add the initial resistance and later resistance rise of the filter to the system budget.

Total resistance of the filter chain : If there are primary, intermediate or other filter sections in the box, the resistance of the entire filter chain and the fan operating point should be checked. The V-type high-efficiency filter is responsible for terminal filtration, and its resistance should be viewed in the entire chain.

Available static pressure of the fan : Obtain the resistance data of the candidate product under the design air volume, and compare it with the fan performance curve to confirm whether the operating point is within the acceptable range. The resistance of the V-shaped structure is related to the filter material area and pleat design, and may vary greatly between different products.

Final resistance margin : When the filter element reaches the advanced stage of dust accumulation, the resistance will increase. When selecting the model, it is necessary to confirm that the fan can still meet the design air volume under the final resistance condition, and it cannot be calculated based on the initial resistance alone. If the rated air volume of a single V-shaped filter element is not enough to cover the needs of the filter section, it can be evaluated Are other structural forms such as high air volume box-type high-efficiency filters more suitable?

Pay attention to sealing and maintenance

Confirm the sealing structure, compression method and on-site leak detection conditions between the filter element and the installation frame.

Sealing method : gasket compression or liquid tank sealing, which should correspond to the installation frame. The V-shaped filter element has a long sealing edge all around, and the distribution of the pressing parts needs to be confirmed.

Leak detection accessibility : The filter material surface of the V-shaped structure is tilted, and the moving path of the probe during scanning leak detection is different from that of the conventional structure. Whether it can completely scan the surrounding interfaces after installation needs to be confirmed during the planning stage.

Replacement method : V-shaped filter elements are usually heavier than flat filter elements of the same cross-section. The transportation and assembly method during replacement must be planned in advance. The shutdown window of the air conditioning box is usually limited, so it is recommended to clarify the operation steps in advance.

Air conditioning box renovation scene

When converting an old box to a V-shaped filter element, there are a few things that need to be checked.

Depth inside the box : The design depth of the original filter section may only be enough to install a flat filter element, and the depth after replacing it with a V-type filter is not enough. When measuring, allow space for installation and sealing.

Access door : The removal path of the V-shaped filter element may be different from that of the flat plate, and the location and size of the access door must match.

Upstream airflow coverage : The V-shaped filter element has a larger windward surface. Whether the upstream airflow can evenly cover each filter element surface needs to be evaluated during the design stage. If there are elbows or reductions upstream, the airflow distribution may be uneven.

Fan capacity : The V-shaped structure provides more space for filter material arrangement, but the original fan may not be able to overcome the total resistance of the newly added filter section. Before modification, the fan operating point must be rechecked according to the new resistance conditions.

Under what circumstances is it not suitable to use V-shaped

There are several situations where a V-shape may not be a suitable choice.

Insufficient depth of the filter section : The depth of the box cannot accommodate the V-shaped structure, and forced modification may affect sealing or maintenance.

The access door is too small : the filter element can be installed but cannot be taken out, and subsequent maintenance will be troublesome.

Insufficient fan margin : The original fan is already close to full load under the original filter chain, and the design air volume cannot be maintained after increasing the resistance of the V-shaped filter section.

Poor upstream airflow distribution : The V-shaped windward surface is large and requires higher uniformity of upstream airflow. If the upstream structure determines that the airflow is biased to one side, part of the V-shaped filter element may not be effectively used.

In these cases, it may be necessary to consider other structural forms, or to adjust them together with the air conditioning box.

About Aili Industrial’s air conditioning box filtration package

Aili Industry can provide high-efficiency filters with different structures, selected according to the size of the filter section and air volume requirements of the air conditioning box. In addition to V-shaped structures, also available High air volume box-type high-efficiency filters and other product forms suitable for large air volume filtration sections. For specific filtration levels and specifications, please refer to HEPA/ULPA Air Filter Product Page.

For renovation projects, it is recommended to provide filter section size, design air volume, existing filter chain configuration and fan parameters to facilitate judgment of whether the solution is suitable. The specific configuration is confirmed with project drawings and test results.