After the FFU design air volume is determined, how should the filter be selected?

Direct answer: First determine the filtration efficiency according to the process cleanliness requirements, and then use the FFU design air volume to check the filter's applicable air volume, resistance, size and sealing method under the air volume. The filter and FFU fan should be checked as a complete machine: the efficiency reaches the standard, but the designed air volume cannot be reached after installation, which is still not a suitable configuration.

The design air volume is the air supply volume that the FFU needs to provide during normal operation, and is also an important condition for comparing filter resistance. If different filter data use different test air volumes, you can only look at the 'initial pressure difference' and cannot judge whether they are installed in the same filter.FFU .Performance after

First write the design air volume as filter selection conditions

The project should clarify the design air volume, cleanliness target, particle control requirements and filter testing requirements of a single FFU. CompareWhen using HEPA and ULPA air filters , suppliers are required to indicate the filter specifications, test air volume and initial resistance under these conditions.

Filter size also affects how well air passes through the filter media. Therefore, you cannot simply select a model based on efficiency level and then directly install any filter of the same level into the FFU; you should check whether its rated use conditions match the project's design air volume.

Use a question to determine whether the whole machine matches

'After assembling this filter, can FFU achieve the design air volume under the gear and resistance conditions agreed on in the project?'

This question involves both filter resistance and fan operating point. If the project usesULPA filter , or to adjust the filter size, the air volume, static pressure and power consumption of the entire machine should be rechecked. It cannot be inferred that the air supply performance remains unchanged by 'the fan remains unchanged'.

Changes in resistance during operation should also be considered. The air volume measured by the new filter can be used as verification data for the initial state, but long-term operation projects should agree on pressure difference monitoring, air volume review and maintenance conditions to confirm that the FFU can maintain the required air supply during the normal maintenance cycle.

Installation structure and inspection cannot be left to last

The filter frame, size and sealing method should match the FFU box; for ceiling or equipment end installation, space for leak detection, maintenance and replacement must be left. The test data of the filter itself and the sealing and air volume tests after installation should be checked separately. Filtration efficiency reports alone are not a substitute for complete machine performance verification.

Aili Industrial can combine the project design air volume, cleanliness requirements, installation dimensions and control gears to match filters, fans, motors and box structures. For batch projects, it is recommended to first determine the prototype filter model, and then write the configuration, test air volume, resistance conditions and complete machine acceptance method into the technical agreement. Specific performance is subject to test results under project conditions.

A selection card can be provided directly when purchasing:

After these four sets of information are determined, filter selection can correspond to the FFU design air volume, rather than staying on the comparison of efficiency levels.