How to choose a high-efficiency filter with or without partitions?

There are two common internal structures of HEPA, with and without partitions. The difference lies in how the filter material is supported and the pleats are fixed.

When selecting, this structural difference should be judged based on the installation conditions. The installation depth, target air volume, leak detection path and maintenance method given by the equipment determine which structure is more suitable. Just looking at the structure name, no conclusion can be drawn.

First look at the structural boundaries given by the device

Installation space is the first constraint.

Smaller installation depth : When the ceiling end or the internal space of the equipment is thin, the partition-free structure is usually more suitable. Its relatively small thickness makes it suitable for locations with limited space. Device-side applications such as The available height of the EFU equipment-end fan filter unit is often determined during the equipment design stage, and the structure selection must be made within this boundary.

Larger installation depth : If the filter section has a deeper space, a partition structure can provide more stable support for the filter material. When handling and installing large-sized products, the rigidity of partitions is usually better.

Disassembly and assembly direction : In addition to thickness, the path for removal and installation must also be considered. In some locations, the opening direction is restricted, and it is necessary to confirm whether the selected structure can pass through smoothly.

Compare performance under the same operating conditions

The structure may be different, and the performance may be different, but comparisons must be made under comparable conditions.

Using the same design air volume, compare the initial resistance and rated air volume of candidate products. Confirm whether the filter material, outer frame and sealing method are consistent. Actual product differences may be greater than the differences implied by the structural names - the pleat design and filter material selection of different manufacturers may be different even if they have partitions.

For matching For the FFU fan filter unit system, the filter element structure will affect the working point of the unit. When selecting, the resistance data should be put into the system for verification. If useful in product candidate For HEPA/ULPA air filters configured at different levels, the efficiency requirements must also be clearly defined.

Make replacement and leak detection executable

After selecting the structure, check the contact surface, leak detection accessibility and spare parts dimensions.

Pressing surface : The outer frame and pressing method of different structures may be different, and they must correspond to the installation frame.

Leak detection accessibility : Whether the filter material surface and surrounding frame can be covered by the detection probe. After some structures are installed, the frame is blocked and needs to be disassembled and assembled during leak detection.

Spare parts size : When replacing the filter element, the size and structure of the new product must match the original system, otherwise it may fit in but not be pressed tightly.

For the liquid tank sealing structure, the matching accuracy between the knife edge and the tank body is required to be relatively high. For the verification method, please refer to the relevant instructions on knife edge size verification.

to install depth screening structures

In actual operation, you can filter in this order:

If the installation depth allowed by the equipment opening is small, first check whether the air volume and resistance of the partition-free solution meet the standards. If the filter section has a deep space, compare the structural support and maintenance methods with partition solutions. The selection process still has to go back to the finished product test data, rather than just looking at the structural description.

For renovation projects, the original installation frames and access openings are designed according to a certain structure. If the structure is changed during replacement, the interfaces and disassembly and assembly paths need to be rechecked. They cannot be replaced just because they are similar in size.

About Aili Industrial’s structural support

Aili Industrial can configure high-efficiency filters with different structures according to the installation depth, air volume and replacement method. filter with FFU fan filter unit、The EFU equipment-end fan filter unit is matched within the same manufacturing system, and the filter element structure and box interface can be confirmed together during the planning stage.

When selecting, it is recommended to check the outer frame, sealing and on-site leak detection conditions at the same time. Specific specifications are subject to confirmed drawings and project technical documents.