How to choose FFU filter for clean corridor? Focus on efficiency, resistance and maintenance conditions

Direct answer: The filter of the clean corridor FFU should first meet the cleanliness and particle control requirements of the corridor, and then check the filtration efficiency, initial resistance, FFU air supply capacity, sealing structure and replacement space under the design air volume. The choice of HEPA or ULPA should be based on project requirements; when changing the filtration level, the air volume of the FFU complete machine must be re-verified.

Clean corridors connect multiple rooms, where people and materials pass frequently, and the airflow at doorways and corners is easily affected by adjacent areas. filter isFFU terminal air supply is a key component, but the cleanliness of the corridor is not only determined by the filtration level. When selecting, the filter should be judged together with the fan, ceiling layout and corridor air return and return conditions.

First determine the filtering requirements based on the purpose of the corridor

The project should identify corridor cleanliness levels, particle control objectives, and whether adjacent rooms have higher cleanliness requirements. Filter efficiency needs to match these requirements, rather than always selecting the highest grade.

CompareWhen using HEPA and ULPA air filters , you should also check the filter testing methods and acceptance requirements used in the project. If selectedFor ULPA filters , its resistance, power consumption and later replacement conditions need to be simultaneously evaluated to confirm that there is a project basis for increasing filtration requirements.

Check filter resistance at design air volume

The pressure difference in the filter product data should indicate the test air volume. Only under comparable air volume and test conditions, the resistance data is meaningful for selection. After determining the filter, you should check whether the FFU equipped with the filter can achieve the target air supply volume under the design gear and actual resistance conditions.

If multiple FFUs are arranged along the corridor, the filter configuration should be unified as much as possible according to the project zoning requirements to facilitate comparison of the operating data of each device. After the filter resistance changes, the air volume of the FFU running at a fixed speed may decrease; if the speed adjustment scheme is used to maintain the air volume, the operating gear, power consumption and noise changes should be checked.

Check seals, dimensions and replacement space

The overall dimensions, frame and sealing method of the filter should match the FFU box. Beams, lamps, sprinklers and access openings in the suspended ceiling may limit the space for filter replacement. The corridor is a continuous traffic area, and the maintenance plan should also consider the impact of replacement operations on on-site use.

For batch projects, it is recommended to first confirm the filter installation, sealing and performance under the target air volume through a prototype, and then check the air supply and cleanliness of the complete machine according to the technical agreement on site. Only checking the filter's individual efficiency report does not replace operational verification after FFU installation.

How does Aili Industry cooperate with clean corridor filter selection?

Aili Industry can match filters, fans, motors and box structures based on corridor cleanliness requirements, ceiling modulus, target air volume and maintenance conditions. During technical communication, it is recommended to provide corridor floor and ceiling plans, adjacent room uses, filtration requirements, target air volume, power supply and estimated number of FFU. Specific filter specifications and overall machine performance are subject to the project technical agreement and test results under agreed working conditions.

Q: Is it necessary to use ULPA filters to clean corridors?
Answer: Not necessarily. It should be selected according to the cleanliness and particle control requirements of the project, and the resistance and FFU air volume should be checked simultaneously.

Q: Can filters of the same grade be directly interchanged?
Answer: It is also necessary to check the resistance, frame size, sealing method and testing requirements under the design air volume. The performance of the complete machine should be verified after replacement.

Question: If the filter efficiency reaches the standard, does the cleanliness of the corridor necessarily reach the standard?
Answer: It is also necessary to check the supply air distribution, return air path, door operating status and on-site cleanliness test results.