{"id":15626,"date":"2026-05-29T09:55:16","date_gmt":"2026-05-29T01:55:16","guid":{"rendered":"https:\/\/www.hencolin.com\/?p=15626"},"modified":"2026-05-29T10:07:34","modified_gmt":"2026-05-29T02:07:34","slug":"how-to-replace-medium-efficiency-bag-filters4-step-standard-replacement-sop-and-differential-pressure-management-guide","status":"publish","type":"post","link":"https:\/\/www.hencolin.com\/en\/info-air-filter\/how-to-replace-medium-efficiency-bag-filters4-step-standard-replacement-sop-and-differential-pressure-management-guide\/","title":{"rendered":"How to Replace Medium-Efficiency Bag Filters?4-Step Standard Replacement SOP and Differential Pressure Management Guide"},"content":{"rendered":"\n

Standard Operating Procedure (SOP) for Replacing Medium-Efficiency Pocket \/ Bag Filters<\/h1>\n\n\n\n

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 and help extend the overall lifespan of the HVAC system.<\/p>\n\n\n\n

However, improper replacement procedures \u2014 such as compressing, deforming, or damaging the filter bags through friction \u2014 can not only compromise filtration performance but may also lead to fan motor overload. This guide, prepared by air filtration specialists, provides a rigorous Standard Operating Procedure (SOP) for replacing pocket\/bag filters.<\/p>\n\n\n\n

Quick Reference: Medium-Efficiency Pocket Filter Specifications<\/h1>\n\n\n\n

Before replacement, always verify the specification label located on the side of the filter frame (e.g., Hencolin products) to ensure complete compatibility.<\/p>\n\n\n\n

Specification Item<\/th>Practical Explanation<\/th>Importance for Facility Operation<\/th><\/tr><\/thead>
Air Flow Direction (AIR FLOW)<\/td>Arrow mark \u2b06\ufe0f indicated on the frame<\/td>Determines the expansion direction of the filter bags; incorrect installation is prohibited<\/td><\/tr>
Filtration Efficiency<\/td>Common ratings: F7 (80\u201385%) \/ F8 (90\u201395%)<\/td>Determines intermediate particle capture efficiency; must comply with original system design specifications<\/td><\/tr>
Design Features<\/td>Patented pocket structure, low initial pressure drop<\/td>Provides high dust-holding capacity and low energy consumption under high airflow operation<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Medium-Efficiency Pocket Filter Replacement Procedure (SOP)<\/h1>\n\n\n\n

Step 1: Power Shutdown & Installation Slot Cleaning<\/h2>\n\n\n\n

Procedure:<\/strong>
Completely shut down the AHU\/MAU unit or exhaust fan power supply. Use a lint-free cloth and approved cleaning agent to thoroughly clean the filter housing frame and guide rails.<\/p>\n\n\n\n

Purpose:<\/strong>
Ensure operational safety and prevent accumulated dust or contaminants around the housing frame from entering downstream ductwork during replacement.<\/p>\n\n\n\n

Step 2: Safe Removal of the Used Filter<\/h2>\n\n\n\n

Procedure:<\/strong>
Release all retaining clips or fasteners (such as spring clamps or locking clips). Carefully and steadily pull the saturated pocket filter out of the guide rails using both hands.<\/p>\n\n\n\n

Technical Reminder:<\/strong>
Used filters are typically heavier due to accumulated dust and allergens. Always handle with both hands, avoid shaking the filter, and ensure maintenance personnel wear protective gloves and respiratory protection throughout the process.<\/p>\n\n\n\n

Step 3: Precise Installation of the New Filter<\/h2>\n\n\n\n

Procedure:<\/strong>
Align the new pocket filter with the housing guide rails. Confirm that the \u201cAIR FLOW\u201d arrow on the frame points toward the downstream air outlet direction (allowing the filter pockets to expand freely toward the outlet side). Once verified, smoothly push the filter frame fully into position.<\/p>\n\n\n\n

Technical Reminder:<\/strong>
During installation, ensure that the filter pockets are not snagged or torn by sharp edges on the guide rails. Each pocket should expand freely inside the airflow channel.<\/p>\n\n\n\n

Step 4: Securing & Seal Integrity Inspection<\/h2>\n\n\n\n

Procedure:<\/strong>
Firmly secure all retaining clips or pressure brackets. Visually inspect and physically check that the filter frame is tightly sealed against the housing frame with no visible gaps.<\/p>\n\n\n\n

Purpose:<\/strong>
Prevent airflow bypass. Even small gaps can allow contaminated air to bypass the filter through the path of least resistance, resulting in filtration failure and contamination of downstream FFUs or HEPA filters.<\/p>\n\n\n\n

When Should Pocket Filters Be Replaced?<\/h1>\n\n\n\n

Although pocket filters offer excellent dust-holding capacity with relatively low pressure drop, they remain consumable components. Facility operators should implement a differential pressure management program:<\/p>\n\n\n\n

    \n
  • Record Initial Pressure Drop:<\/strong>
    Immediately after installing a new filter and starting the fan, record the initial differential pressure (Initial P.D.) reading from the pressure gauge.<\/li>\n\n\n\n
  • Replacement Threshold:<\/strong>
    Replace the filter when the differential pressure reaches twice the initial pressure drop, or when it reaches the manufacturer\u2019s specified final pressure drop (typically around 200\u2013300 Pa). At this stage, the filter media pores are saturated. Continued operation may significantly reduce airflow, create overheated process conditions, and sharply increase fan motor energy consumption.<\/li>\n<\/ul>\n\n\n\n

    Frequently Asked Questions (FAQ)<\/h1>\n\n\n\n

    Q1: What is the impact of the number of pockets in a bag filter?<\/h2>\n\n\n\n

    A:<\/strong>
    For the same frame dimensions, a higher number of pockets (e.g., increasing from 6 pockets to 8 pockets) means a larger effective filtration surface area. This provides two major advantages:<\/p>\n\n\n\n

      \n
    1. Lower airflow resistance (reduced energy consumption)<\/li>\n\n\n\n
    2. Greater dust-holding capacity (longer service life and reduced replacement frequency)<\/li>\n<\/ol>\n\n\n\n

      Q2: Can pocket filters be installed horizontally if installation space is limited?<\/h2>\n\n\n\n

      A:<\/strong>
      Horizontal installation is strongly discouraged.<\/p>\n\n\n\n

      The pocket seams must remain in a vertical orientation during installation. If installed horizontally, the lower pockets will sag due to gravity, compressing adjacent pockets and restricting airflow distribution. This significantly reduces dust-holding capacity and may cause localized high air velocity, leading to premature media damage.<\/p>\n\n\n\n

      Q3: Can pocket filters be cleaned and reused?<\/h2>\n\n\n\n

      A:<\/strong>
      Medium-efficiency pocket filters are designed as disposable products. Their media are typically made from precision melt-blown nonwoven fabric or composite fiberglass materials with irreversible micro-porous structures.<\/p>\n\n\n\n

      Cleaning methods such as high-pressure water washing or compressed air blowing will permanently damage the electrostatic properties and microstructure of the filter media. Once cleaned, the filter will lose its ability to effectively capture fine particles.<\/p>\n\n\n\n

      For process safety and indoor air quality assurance, saturated pocket filters should always be replaced rather than reused.<\/p>\n","protected":false},"excerpt":{"rendered":"

      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 […]<\/p>\n","protected":false},"author":10,"featured_media":15627,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_jetpack_memberships_contains_paid_content":false},"categories":[398,141,140],"tags":[],"blocksy_meta":[],"acf":[],"yoast_head":"\nHow to Replace Medium-Efficiency Bag Filters?4-Step Standard Replacement SOP and Differential Pressure Management Guide - Hencolin International |Industrial Air Filter Manufacturer<\/title>\n<meta name=\"description\" content=\"Medium-efficiency pocket filters play a critical role in HVAC systems, cleanrooms, and hospital ventilation by capturing 1\u20135 \u03bcm particles and protecting downstream HEPA filters. 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