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Standard Operating Procedure (SOP) for Replacing Medium-Efficiency Pocket / Bag Filters In large central air-conditioning systems, cleanroom Make-Up Air Units (MAU), as well as hospital and commercial building ventilation systems, medium-efficiency pocket/bag filters are an indispensable core component. With a filtration surface area far greater than that of flat panel filters, they are primarily responsible for capturing suspended particles ranging from 1 to 5 microns ($\mu m$). These filters effectively reduce the load on downstream High-Efficiency Particulate Air (HEPA) filters

In high-standard clean environments such as semiconductor manufacturing, microelectronics, biopharmaceutical production, and hospital operating rooms, the HEPA Mini-Pleat Filter is commonly used as the final-stage filtration core for ceiling diffusers or Fan Filter Units (FFUs). With a filtration efficiency of up to H14 (99.999%), it serves as the last line of defense against particle contamination in critical production processes. Because mini-pleat HEPA filters feature densely folded pleats and delicate filter media, improper handling during installation may easily cause frame deformation

In spray paint booths, baking paint rooms, air supply/exhaust systems, and negative-pressure ventilation equipment, Fiberglass Filter Media is the most commonly used first line of defense for capturing paint mist and large dust particles. However, in many on-site operations, improper installation direction or poor sealing of the filter often leads to restricted airflow, reduced ventilation efficiency, or even fan damage. This article, prepared by a professional filtration engineering team, provides a complete breakdown of the standard installation procedures and core