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High efficiency filter maintenance tips

Time: 2023-03-31

High efficiency filter maintenance tips

Maintenance of HEPA filters is a very important issue, so how to maintain a good HEPA filter? Let's first understand what is HEPA filter: HEPA filter is mainly used to capture granular dust below 0.3um and a variety of suspended matter. The ultrafine glass fiber paper is used as filter material, offset paper, aluminum film and other materials as partition plate, and the high efficiency filter frame is made. Each set has been tested, with high filtration efficiency, low resistance, large dust capacity and other characteristics.

How do you maintain HEPA filters?

1. Before the high efficiency filter is installed, it is not allowed to tear or open the packaging bag or film by hand. The air filter should be stored in strict accordance with the direction standard marked on the packing box of the high efficiency filter; In the handling process of high efficiency air filter, should be handled lightly, to avoid violent vibration and collision.

2. The transportation and storage of HEPA filters should be shelved in accordance with the direction of the manufacturer's signs. In the process of transportation, should be handled lightly, to prevent violent vibration and collision, can not be forced to load and unload.

3, before the installation of high efficiency filter, must be unpacked at the installation site for appearance inspection, including: filter paper, sealant and frame damage; Whether the side length, diagonal and thickness dimensions meet the requirements; The frame has burrs and rust spots (metal frame); Whether the product certificate, technical performance is in line with the design requirements. Then the inspection shall be carried out in accordance with the method specified in the national standard "Code for Construction and Acceptance of Clean Rooms" [JGJ71-90], and the qualified ones shall be installed immediately.

4, for high efficiency filter, installation direction must be correct: with corrugated plate filter combination in vertical installation, corrugated plate must be perpendicular to the ground; The connection between the vertical filter and the frame is strictly prohibited from leakage, deformation, damage and glue leakage, etc., after installation, the inner wall must be clean, no dust, oil, rust and debris...

5, inspection method: observation or white silk wipe inspection.

6. Before the installation of high efficiency filter, the clean room must be comprehensively cleaned and wiped. If there is dust accumulation inside the air conditioning system, it should be cleaned and wiped again to meet the cleaning requirements. If the high efficiency filter is installed in the technical sandwich or the ceiling, the technical layer or the ceiling should also be comprehensively cleaned and wiped.

7. High efficiency filters with cleanliness level equal to or higher than 100 for clean rooms should be leak-detected before installation according to the method specified in "Clean Room Construction and Acceptance Code" [JGJ71-90], and meet the requirements specified.

8, for high efficiency filter, when the filter resistance value is greater than 450Pa; Or when the airflow velocity on the outlet surface is reduced to the minimum, the airflow velocity can not be increased even after the replacement of the coarse effect and medium effect filter; Or when the surface of the high efficiency filter can not be repaired leakage situation, must be replaced with a new high efficiency filter; If there is no such condition, it can be replaced once every 1-2 years according to the environmental conditions.

9. Leak detection method of high efficiency filter, particle counter sampling head must be inserted into the exhaust air hydrostatic box (or pipeline) connected with the exhaust air high efficiency filter (this is different from the scanning leak detection of the supply air high efficiency filter, because the leak detection side of the supply air high efficiency filter is exposed indoors, The leak detection side of the exhaust air high efficiency filter is deep in the static pressure box or pipeline) can be scanned on the leak detection side of the exhaust air high efficiency filter according to the above method.

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