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China Synthetic Fiber Medium Pocket Filter Suppliers - EN 779 Certified, Various Frame Thickness Options Available

Introducing our high-quality air filters, crafted with precision in our state-of-the-art factory in China. Each filter features a robust frame made from aluminum and galvanized steel sheets, ensuring durability and reliability in various operating conditions, Our filters are designed with synthetic fiber media that maximizes efficiency, providing remarkable performance ratings: 45%@0.5μm, 65%@0.5μm, 85%@0.5μm, 90%@0.5μm, and 95%@0.5μm. With thickness options of 21mm, 25mm, and 46mm, these filters are ideal for a range of applications, Meeting the EN 779 standards, our products are classified as M5, M6, F7, F8, and F9, making them suitable for high-efficiency air filtration. They operate effectively under temperature conditions up to 90℃ and humidity levels of up to 90% RH, As a leading supplier in the industry, our commitment to quality and performance has established us as a trusted source for air filtration solutions. Choose our air filters for unparalleled efficiency and reliability, straight from our factory in China
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    Product Details

    Application Area

    Pockets filters are widely used in central air conditioning ventilation systems, pharmaceutical, hospital, electronics, food and other industrial environments, and can also serve as the medium filter for high-efficiency air filters.

    Filter Media Materials

    This is the key component that determines filtration efficiency, primarily made from synthetic chemical fibers.

    Main Types
    Synthetic Fiber The most commonly used and mainstream material. It offers good strength, stable performance, and high cost-effectiveness.
    Polypropylene Fiber Possesses good chemical corrosion resistance, remains stable especially in humid environments, and is not prone to mold.
    Material Form and Manufacturing Process
    Non-woven Fabric: The vast majority of synthetic fiber bag filters utilize the non-woven fabric process. Fibers are randomly interlocked through methods like needle punching, melt blowing, or spun bonding, forming a three-dimensional web of varying depth.
    Structural Characteristics: This disordered structure creates countless curved, intricate micron-sized channels that capture particulate matter through the following mechanisms:
    • 1
      Interception Effect Particles are directly trapped on the fibers.
    • 2
      Inertial Impact Larger particles deviate from the air streamlines due to inertia and collide with the fibers.
    • 3
      Diffusion Effect Very small particles randomly collide with fibers due to Brownian motion.
    • 4
      Electrostatic Effect Some synthetic filter media carry an electrostatic charge, which enhances the adsorption capacity for fine particles.
    Support and Structural Frame Materials

    To enable the soft filter media to function stably, the following structural materials are required:

    Bag Support Frame: Inside each filter bag, there is typically a V-shaped or U-shaped support frame made of galvanized steel wire or plastic.
    Function: Prevents the filter from collapsing under airflow during operation, ensuring each filter bag remains fully expanded. This guarantees maximum effective filtration area and lower system resistance.
    Frame Materials
    Galvanized Steel Sheet The most common choice, offering good strength and low cost, meeting the requirements for most air handling units.
    Aluminum Profile Lighter in weight with good corrosion resistance, often used in weight-sensitive applications or special environments.
    EN 779 Synthetic Fiber Medium Pocket Filter (1)EN 779 Synthetic Fiber Medium Pocket Filter (1)
    The Efficiency of Pocket Filter
    ⚡

    Efficiency Range: 45% – 95% — Pockets filters can be selected based on specific requirements. The rational selection of filter efficiency and face velocity contributes to comprehensive economic benefits.

    For filters made of the same material, higher efficiency typically results in greater resistance and higher cost, while lower efficiency leads to reduced resistance and cost. Altering the air velocity will also affect resistance, efficiency, and the number of filters required, so appropriate selection should be made according to specific conditions.

    EN 779 Synthetic Fiber Medium Pocket Filter (2)EN 779 Synthetic Fiber Medium Pocket Filter (3)
    Service Life of Filters
    ⚠️

    As dust accumulates on the filter media, the resistance increases. When the resistance reaches an unreasonable level, the filter must be discarded. Sometimes, excessive resistance can cause previously captured dust to become dislodged and re-enter the airflow; when this risk arises, the filter should also be replaced.

    The resistance of a filter increases with higher airflow rates. By increasing the surface area of the filter media, the relative velocity of air passing through the filter can be reduced, thereby decreasing the resistance.

    Wind Velocity Relationship Diagram
    Wind Velocity Relationship Diagram (1)
    Product Parameters
    Wind Velocity Relationship Diagram (2)
    Remarks: (1) Initial resistance tolerance of ± 10%    (2) Support customer size
    Frequently Asked Questions
    Q What industries are pocket filters typically used in?
    Pocket filters are widely used across central air conditioning ventilation systems, as well as in pharmaceutical, hospital, electronics, and food processing industries. They can also function as medium pre-filters for high-efficiency (HEPA) filtration systems.
    Q What filtration efficiency range do pocket filters offer?
    Pocket filters are available in a wide efficiency range from 45% to 95%, allowing users to select the appropriate grade based on specific air quality requirements and system design considerations.
    Q What filter media materials are used in pocket filters?
    The primary filter media is made from synthetic chemical fibers, most commonly standard synthetic fiber or polypropylene fiber. These are manufactured using non-woven fabric processes such as needle punching, melt blowing, or spun bonding, forming a three-dimensional fibrous structure for effective particle capture.
    Q How does airflow velocity affect pocket filter performance?
    Higher airflow velocity increases resistance across the filter, which can affect both efficiency and system energy consumption. By selecting filters with larger media surface areas, the face velocity can be reduced, lowering resistance and extending service life. Appropriate face velocity selection is essential for optimizing system performance.
    Q When should a pocket filter be replaced?
    A pocket filter should be replaced when its resistance reaches an unreasonably high level due to dust accumulation. Additionally, if excessive resistance causes previously captured dust to dislodge and re-enter the airstream, immediate replacement is recommended to maintain air quality and system safety.
    Q What frame materials are available for pocket filters?
    Pocket filter frames are commonly made from galvanized steel sheet, which offers good strength and low cost suitable for most air handling units. Aluminum profiles are also available for applications that require lighter weight or enhanced corrosion resistance in special environments. Custom sizes are also supported upon customer request.