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How do you install an air filter?
Release Date:
2021-05-14
To ensure effective air purification, purification equipment typically requires periodic replacement of its internal air filters. Currently, most cleanrooms install air filters at the ceiling supply vents; the installation method and pre-installation verification are critical in determining whether the high-efficiency air filter has any leakage points.
To ensure effective air purification, the purification equipment generally requires regular replacement of its internal components. Air filter Currently, most cleanrooms install air filters at the ceiling supply vents; the installation method and pre-installation verification are critical in determining whether the filter has any leakage points. Pre-installation verification is intended to establish valid, objective conditions, so it is essential to pay close attention to proper techniques and procedures during installation. Key precautions: the air filter must be replaced only after the HVAC system’s supply airflow has been shut off; and the sealing gasket between the filter and its mounting frame must be tight and leak-free to ensure optimal filtration performance.
Installation Method for Air Filters
Prior to the installation of air filters, the cleanroom must be thoroughly cleaned and wiped down. If there is accumulated dust inside the air-conditioning system, it shall be cleaned and wiped down again until cleanliness requirements are met. When filters are installed in technical plenums or suspended ceilings, these spaces must also be comprehensively cleaned and wiped down.
Prior to installation, the components must be thoroughly cleaned. Air supply outlets equipped with air filters shall be installed and replaced in a cleanroom, and sealing gaskets must be installed at the joints between the outlet flange and the ceiling panel. For outlets installed and filter screens replaced within technical plenums, short stub pipes shall be pre-embedded during civil construction prior to installation; any gaps between the stub pipes and the ceiling panel must be tightly sealed. Outlets with damaged surface coatings shall not be installed. Upon completion of installation, the outlets shall be promptly connected to the ductwork, and the open ends shall be tightly sealed with plastic film and adhesive tape.
After the cleanroom and the purified air-conditioning system have met the cleanliness requirements, the purified air-conditioning system must be put through a trial run. It shall operate continuously for at least 12 hours, after which the cleanroom shall be cleaned and wiped down again, and the air filters shall be installed immediately.
The filter packaging must be opened at the installation site for a visual inspection, which shall include checking for damage to the filter media, sealing gasket, and frame; verifying that the side lengths, diagonal dimensions, and thickness comply with the specified requirements; inspecting the frame for burrs and rust (for metal frames); and confirming the presence of a product certificate of conformity and that the technical performance meets the design requirements. Leak testing shall then be performed. Filters that pass both the visual inspection and leak test shall be installed immediately. During installation, the filters should be properly matched based on their individual resistance values: for unidirectional airflow systems, the difference between the rated resistance of each filter and the average resistance of all filters on the same air outlet or supply air surface shall be less than 5%.
When installing the air filter, the arrow on the frame must align with the direction of airflow. If the filter is installed vertically, the pleat seams of the filter media should be perpendicular to the floor. When sealing the joint between the filter and the frame using gaskets, pressure-sensitive adhesive, negative-pressure sealing, liquid-seal, or double-ring sealing, the surfaces of the packing material, the filter frame, the frame itself, and the liquid seal must all be thoroughly cleaned.
Keywords:
Air filter
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Nantong Lushen Environmental Protection Purification Materials Co., Ltd.
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Building 28, Jingyuan Ruigu Ecological Technology City, Chongchuan District, Nantong City, Jiangsu Province
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